Boss GP-20 Amp Factory
pedal
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Why this number?
The typical used price is the median of 15 used sales observed in the last 24 months, with outliers removed and the figure rounded. An observed sale is often the last asking price rather than a confirmed hammer price.
| Typical used price | €80 | median sold, rounded |
| Most sold between | €70–€85 | 25th to 75th percentile, same window |
| Window | last 24 months | the tightest of 90 days, 6 months and 24 months with 8 used sales |
| Sample | 15 used sales | thin data, treat as a rough guide |
| Time to sell | — | only counted from listings we watch start to finish; not enough yet |
| Live asks | €103 | typical ask across 3 listings, 29% above typical used |
| Outliers | dropped | beyond 10× the product’s own median: bundles, parts, typos |
| All-time | €75 | 161 used sales, 2013–2026; not used for deals |
| Sales on record | 172 | all-time, all platforms |
Typical prices are rounded (to 5 / 10 / 50 / 100 by size, in whichever currency you read); asks and the chart are exact. As of 18 October 2026. Full method, including what each badge means
For sale right now
The best-priced as cards, a row of them; every other ad as a line, by ask. Each ask is the seller’s own number; the platform’s mark opens the listing. Each one says when we last confirmed it at its source: the price and availability are from that visit, so check the marketplace before you go.
Reverb
Price history
Every recorded sale, one point each: 172 of them, placed by the day the ad went up. The line follows the middle of the sales around each point, with the middle half behind it, and breaks wherever nothing sold nearby. Condition is mixed, so some of the spread is a mint against a fair rather than the market moving.
Recent sales by listing date
15 used sales · last 24 months · middle half €70–€85 · thin
| Listed | Price | Condition | From | Platform | The listing |
|---|---|---|---|---|---|
| 5 Aug 2026 | €81$95 as sold | excellent |   Italy | Reverb | Details |
| 4 Jul 2026 | €56$65 as sold | parts |  United States | Reverb | Details |
| 27 Jun 2026 | €107$125 as sold | good | United States | Reverb | Details |
| 17 Mar 2026 | €73$85 as sold | good |  France | Reverb | Details |
| 19 Dec 2025 | €85$99 as sold | very good | United States | Reverb | Details |
A date is the day the ad went up. Marketplaces do not publish the day a sale closed; each of these had sold by the time we recorded it, in August 2026 and October 2026. A price is what the listing last asked, converted at that day’s rate.
Show the last 50 of 172 recorded sales
| Listed | Price | Condition | From | Platform | The listing |
|---|---|---|---|---|---|
| 25 Jan 2026 | €61$71 as sold | good | United States | Reverb | Details |
| 6 Dec 2025 | €85$95 as sold | excellent | United States | Reverb | Details |
| 21 Oct 2025 | €64$75 as sold | very good | United States | Reverb | Details |
| 21 Jun 2025 | €107$125 as sold | mint | United States | Reverb | Details |
| 6 May 2025 | €62$70 as sold | excellent | United States | Reverb | Details |
| 9 Mar 2025 | €28$33 as sold | parts | United States | Reverb | Details |
| 26 Feb 2025 | €76$88 as sold | very good |  Canada | Reverb | Details |
| 25 Feb 2025 | €86$100 as sold | excellent | United States | Reverb | Details |
| 19 Feb 2025 | €86$100 as sold | good | United States | Reverb | Details |
| 23 Dec 2024 | €88$99 as sold | very good | United States | Reverb | Details |
| 22 Dec 2024 | €52$60 as sold | good | United States | Reverb | Details |
| 18 Dec 2024 | €80$90 as sold | very good | United States | Reverb | Details |
| 22 Nov 2024 | €39$45 as sold | parts | United States | Reverb | Details |
| 14 Oct 2024 | €77$90 as sold | very good | United States | Reverb | Details |
| 10 Oct 2024 | €76$89 as sold | very good | United States | Reverb | Details |
| 22 Aug 2024 | €42$49 as sold | very good | United States | Reverb | Details |
| 8 Aug 2024 | €80$93 as sold | mint | United States | Reverb | Details |
| 20 Jun 2024 | €134$156 as sold | very good |  United Kingdom | Reverb | Details |
| 27 May 2024 | €52$60 as sold | fair | United States | Reverb | Details |
| 9 May 2024 | €26$30 as sold | parts | United States | Reverb | Details |
| 28 Apr 2024 | €90$105 as sold | very good | Canada | Reverb | Details |
| 2 Apr 2024 | €116$135 as sold | very good | Canada | Reverb | Details |
| 2 Feb 2024 | €33$38 as sold | poor | United States | Reverb | Details |
| 4 Jan 2024 | €103$120 as sold | good |  Australia | Reverb | Details |
| 9 Dec 2023 | €103$120 as sold | excellent | United States | Reverb | Details |
| 6 Dec 2023 | €86$100 as sold | very good | United States | Reverb | Details |
| 4 Dec 2023 | €76$85 as sold | good | United States | Reverb | Details |
| 16 Nov 2023 | €85$99 as sold | good | United States | Reverb | Details |
| 10 Nov 2023 | €116$135 as sold | very good | United States | Reverb | Details |
| 17 Oct 2023 | €42$49 as sold | parts |  Belgium | Reverb | Details |
| 12 Oct 2023 | €77$90 as sold | mint | United States | Reverb | Details |
| 12 Aug 2023 | €127$148 as sold | very good | Australia | Reverb | Details |
| 9 Aug 2023 | €77$90 as sold | very good | United States | Reverb | Details |
| 22 Jul 2023 | €86$100 as sold | very good | United States | Reverb | Details |
| 19 Jun 2023 | €89$100 as sold | excellent | United States | Reverb | Details |
| 30 May 2023 | €129$150 as sold | excellent | United States | Reverb | Details |
| 12 May 2023 | €97$113 as sold | excellent | United Kingdom | Reverb | Details |
| 11 Apr 2023 | €88$99 as sold | good | United States | Reverb | Details |
| 28 Mar 2023 | €65$75 as sold | very good | United States | Reverb | Details |
| 9 Mar 2023 | €90$105 as sold | very good | United States | Reverb | Details |
| 8 Mar 2023 | €139$162 as sold | excellent | United Kingdom | Reverb | Details |
| 17 Jan 2023 | €86$100 as sold | mint | United States | Reverb | Details |
| 15 Jan 2023 | €117$136 as sold | very good |  Japan | Reverb | Details |
| 19 Dec 2022 | €60$70 as sold | fair |  Poland | Reverb | Details |
| 14 Dec 2022 | €85$99 as sold | mint | United States | Reverb | Details |
A date is the day the ad went up. Marketplaces do not publish the day a sale closed; each of these had sold by the time we recorded it, in August 2026 and October 2026. A price is what the listing last asked, converted at that day’s rate.
Cheapest live: Canada €98 · Poland €103 · 
Spain €134 · before shipping
In one paragraph
The page's figures as one paragraph, assembled for quoting; not written by hand.
The Boss GP-20 Amp Factory sold for a median of €80 over the last 24 months across 15 recorded sales, with most examples landing between €70 and €85. There are 3 listings live right now across Reverb, from €98 asking. Figures computed 18 October 2026 by Doirado from cross-platform listing data.