Ferrofish B4000+ B-4000
keyboard
Has sold for €280 over 2019–2026, across 15 used sales. Too few in the last two years for a typical price today.
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Not enough sold data for a typical price. 9 for sale, from €229. New: €352 at Thomann.
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.
1 local pickup ad in Germany, on Kleinanzeigen. Showing 1 local pickup ad in Germany, on Kleinanzeigen. Local pickup near you, in Germany: 1 ad on Kleinanzeigen.
Reverb
eBay United States
eBay Germany
3 more live · €443–€460 · typical ask €409 · 2 United States · 1 Germany
Price history
Every recorded sale, one point each: 18 of them, placed by the day the ad went up. Too few sales to draw a trend through them without inventing one, so the points speak for themselves. Condition is mixed, so some of the spread is a mint against a fair rather than the market moving.
Recent sales by listing date
| Listed | Price | Condition | From | Platform | The listing |
|---|---|---|---|---|---|
| 26 Sept 2026 | €535$600 as sold | new |  United States | Reverb | Details |
| 14 Aug 2026 | €219 | good |   Germany | eBay Germany | Details |
| 30 Jun 2026 | €257$299 as sold | excellent | United States | Reverb | Details |
| 24 Sept 2025 | €275$320 as sold | mint | United States | Reverb | Details |
| 22 Aug 2025 | €343$399 as sold | new | 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 Marketplaces do not publish the day a sale closed; each of these had sold by the time we recorded it, in August 2026 and October 2026.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 all 18 recorded sales
| Listed | Price | Condition | From | Platform | The listing |
|---|---|---|---|---|---|
| 14 Aug 2026 | €219 | good | Germany | eBay Germany | Details |
| 22 Jul 2025 | €283$329 as sold | mint | United States | Reverb | Details |
| 12 Jul 2025 | €322$375 as sold | very good | United States | Reverb | Details |
| 12 Jan 2025 | €236$275 as sold | mint | United States | Reverb | Details |
| 13 Oct 2024 | €242$282 as sold | mint |  Canada | Reverb | Details |
| 28 Apr 2024 | €313$365 as sold | excellent | United States | Reverb | Details |
| 2 Oct 2023 | €292$340 as sold | mint | United States | Reverb | Details |
| 12 Jul 2023 | €291$339 as sold | mint | United States | Reverb | Details |
| 21 May 2023 | €283$330 as sold | mint | United States | Reverb | Details |
| 3 Aug 2022 | €343$399 as sold | excellent | United States | Reverb | Details |
| 24 Feb 2021 | €355$414 as sold | mint | Canada | Reverb | Details |
| 8 Nov 2020 | €313$365 as sold | mint | United States | Reverb | Details |
| 21 Nov 2019 | €301$350 as sold | excellent | 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: 
Belgium €229 · United States €240 · 
United Kingdom €298 · Germany €409 · before shipping
15 recorded sales of the Ferrofish B4000+ B-4000 from 2019–2026, all-time around €280. Too few in the last two years to quote a typical used price. Cheapest live €229 before shipping. Figures computed 18 October 2026.