This price has not changed since 2026-08-28 07:13 UTC. It reflects the last observed trade rather than current market value, and this page is excluded from our sitemap for that reason.
Community price on backpack.tf: 6.50–7.00 keys, last changed 2020-04-30 (6.5y ago). The live quote above, 8.14 keys, is 25% higher and last moved 2mo ago. They are different measures: the quote is what traders and bots are asking and bidding on the classifieds right now, and it moves for thousands of items every day; the community price is a suggestion accepted by vote, which changes only when someone argues it should. A quote well away from the vote is usually a price that is about to be re-argued. Community prices from backpack.tf, read under an hour ago.
Steam Market asking price: $33.90 — the lowest of one listing for the Kill-a-Watt effect when we looked on 2026-10-10 01:35 UTC (3d ago). This is what a seller is asking, not what anything sold for. Steam pays out in Steam wallet funds, not cash, and Valve takes roughly 15% at the till — so asking prices there run well above the 8 keys, 9 ref shown above, which comes from the keys-and-metal market on backpack.tf. The two are different markets and are never blended. Steam lists the item as “Unusual Doctor's Sack”, with no effect in the name — the effect comes from the individual listing.
Price history
Interactive chart. Press the left and right arrow keys to move along the series, Home or End to jump to either end, Escape to clear.
The key axis converts at today's rate. Prices are recorded in metal, so a line that is flat in keys followed the key rate rather than standing still.
| Observed (UTC) | Sell | Buy |
|---|---|---|
| 25 SEP 2025 · 03:29 UTC | 6.92 keys | 5.22 keys |
| 30 SEP 2025 · 20:25 UTC | 7.95 keys | 5.28 keys |
| 9 OCT 2025 · 08:08 UTC | 7.61 keys | 5.51 keys |
| 19 OCT 2025 · 19:54 UTC | 7.24 keys | 5.28 keys |
| 25 OCT 2025 · 16:13 UTC | 6.89 keys | 5.06 keys |
| 10 NOV 2025 · 00:14 UTC | 7.29 keys | 5.29 keys |
| 19 NOV 2025 · 10:36 UTC | 10.1 keys | 6.69 keys |
| 24 NOV 2025 · 20:32 UTC | 10.3 keys | 7.14 keys |
| 3 DEC 2025 · 20:47 UTC | 10.3 keys | 7.20 keys |
| 8 DEC 2025 · 12:43 UTC | 10.6 keys | 7.43 keys |
| 23 DEC 2025 · 11:10 UTC | 10.7 keys | 7.48 keys |
| 30 DEC 2025 · 20:47 UTC | 9.50 keys | 6.61 keys |
| 22 JAN 2026 · 23:43 UTC | 8.02 keys | 6.51 keys |
| 29 JAN 2026 · 01:43 UTC | 7.82 keys | 6.66 keys |
| 1 FEB 2026 · 23:43 UTC | 7.46 keys | 6.38 keys |
| 8 FEB 2026 · 16:20 UTC | 7.21 keys | 6.27 keys |
| 15 FEB 2026 · 22:39 UTC | 7.67 keys | 6.78 keys |
| 22 FEB 2026 · 00:40 UTC | 7.09 keys | 6.15 keys |
| 8 MAR 2026 · 20:41 UTC | 6.84 keys | 4.31 keys |
| 17 MAR 2026 · 10:06 UTC | 7.54 keys | 6.34 keys |
| 2 APR 2026 · 22:30 UTC | 7.71 keys | 6.37 keys |
| 11 APR 2026 · 16:30 UTC | 7.73 keys | 6.39 keys |
| 27 APR 2026 · 12:32 UTC | 7.69 keys | 6.37 keys |
| 9 JUN 2026 · 18:31 UTC | 8.50 keys | 6.08 keys |
| 16 JUN 2026 · 08:10 UTC | 8.42 keys | 6.47 keys |
| 25 JUN 2026 · 09:12 UTC | 7.37 keys | 6.41 keys |
| 29 JUN 2026 · 21:11 UTC | 7.69 keys | 6.69 keys |
| 5 JUL 2026 · 17:11 UTC | 7.63 keys | 6.63 keys |
| 16 JUL 2026 · 00:44 UTC | 7.98 keys | 6.94 keys |
| 29 JUL 2026 · 02:45 UTC | 8.49 keys | 7.39 keys |
| 4 AUG 2026 · 09:12 UTC | 8.83 keys | 7.68 keys |
| 11 AUG 2026 · 13:12 UTC | 8.87 keys | 7.72 keys |
| 16 AUG 2026 · 07:11 UTC | 8.90 keys | 7.74 keys |
| 28 AUG 2026 · 07:13 UTC | 8.14 keys | 7.08 keys |
| 5 OCT 2026 · 09:08 UTC | 8.21 keys | 7.14 keys |
Price history in numbers
35 readings since 25 Sep 2025The price has not been re-read inside the last 30 days. Over a year it ranged from 6.84 keys to 10.7 keys (up 13.4%). Today's 8.21 keys sits in the middle of its range: the lowest we have recorded is 6.84 keys (8 Mar 2026) and the highest 10.7 keys (23 Dec 2025). The price has moved 33 times since we began recording it — about once every 11 days.
| Window | Low | High | Change | Moves | Readings |
|---|---|---|---|---|---|
| 90 days | 7.98 keys | 8.90 keys | +2.9% | 6 | 7 |
| a year | 6.84 keys | 10.7 keys | +13.4% | 30 | 32 |
Details
| SKU | 398;5;u56 |
|---|---|
| Last price change | 2026-08-28 07:13 UTC |
| Key rate when recorded | 64.22 ref |
Same effect, other items
the effect across the catalogue| Item | Value | Updated |
|---|---|---|
| 1,111 keys | 11mo ago | |
| 1,100 keys | 11mo ago | |
| 1,100 keys | 11mo ago | |
| 760 keys | 20d ago | |
| 387 keys | 11d ago | |
| 303 keys | 14d ago | |
| 283 keys | 12d ago | |
| 283 keys | 12d ago | |
| 261 keys | 18d ago | |
| 265 keys | 11d ago |
Other effects on the Doctor's Sack
same item, different effect| Item | Value | Updated |
|---|---|---|
| 2,000 keys | 5mo ago | |
| 1,000 keys | 11mo ago | |
| 780 keys | 11mo ago | |
| 500 keys | 11mo ago | |
| 270 keys | 11mo ago | |
| 169 keys | 12d ago | |
| 137 keys | 2mo ago | |
| 139 keys | 13d ago | |
| 132 keys | 12d ago | |
| 104 keys | 12d ago |
Priced similarly
across the catalogue| Item | Value | Updated |
|---|---|---|
| 8.14 keys | 2mo ago | |
| 8.39 keys | 11d ago | |
| 8.14 keys | 1mo ago | |
| 8.14 keys | 2mo ago | |
| 8.39 keys | 11d ago | |
| 8.25 keys | 12d ago | |
| 8.14 keys | 1mo ago | |
| 8.23 keys | 23d ago |