Community price on backpack.tf: 13.0 keys, last changed 2020-07-25 (6.1y ago). The live quote above, 13.5 keys, is 4% higher and last moved 20h 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: $37.48 — the lowest of 3 listings for the Kill-a-Watt effect when we looked on 2026-09-01 01:40 UTC (5d 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 13 keys, 33.88 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 Barnstormer”, with no effect in the name — the effect comes from the individual listing.
Price history
66 observations
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.
Kill-a-Watt Barnstormer sell price, 2025-09-25 to 2026-09-05: 66 observations, from 12.9 keys to 13.5 keys. Sampled evenly across the range.
Observed (UTC)
Sell
Buy
25 SEP 2025 · 03:29 UTC
12.9 keys
10.5 keys
9 OCT 2025 · 08:24 UTC
13.3 keys
11.9 keys
19 OCT 2025 · 20:11 UTC
12.6 keys
11.4 keys
2 NOV 2025 · 22:32 UTC
12.9 keys
8.59 keys
16 NOV 2025 · 22:36 UTC
13.7 keys
10.8 keys
26 NOV 2025 · 08:48 UTC
14.2 keys
11.8 keys
10 DEC 2025 · 18:54 UTC
14.6 keys
8.29 keys
29 DEC 2025 · 02:51 UTC
17.6 keys
8.11 keys
9 JAN 2026 · 11:37 UTC
16.0 keys
7.50 keys
1 MAR 2026 · 10:41 UTC
9.26 keys
7.70 keys
22 JUN 2026 · 17:13 UTC
8.55 keys
7.44 keys
29 JUN 2026 · 01:14 UTC
8.53 keys
7.37 keys
12 JUL 2026 · 22:44 UTC
8.75 keys
7.61 keys
29 JUL 2026 · 00:45 UTC
11.2 keys
9.81 keys
3 AUG 2026 · 00:24 UTC
11.7 keys
10.2 keys
21 AUG 2026 · 02:08 UTC
12.0 keys
10.5 keys
22 AUG 2026 · 04:09 UTC
12.0 keys
10.5 keys
22 AUG 2026 · 16:08 UTC
12.1 keys
10.5 keys
23 AUG 2026 · 18:08 UTC
12.1 keys
10.5 keys
24 AUG 2026 · 20:09 UTC
12.3 keys
10.7 keys
25 AUG 2026 · 08:09 UTC
12.3 keys
10.7 keys
26 AUG 2026 · 08:08 UTC
12.4 keys
10.8 keys
27 AUG 2026 · 08:08 UTC
12.4 keys
10.8 keys
27 AUG 2026 · 22:09 UTC
12.5 keys
10.8 keys
28 AUG 2026 · 22:09 UTC
12.6 keys
11.0 keys
29 AUG 2026 · 16:09 UTC
12.5 keys
10.9 keys
29 AUG 2026 · 20:09 UTC
12.6 keys
10.9 keys
30 AUG 2026 · 04:09 UTC
12.6 keys
11.0 keys
30 AUG 2026 · 12:08 UTC
12.9 keys
11.3 keys
30 AUG 2026 · 16:07 UTC
12.7 keys
11.0 keys
31 AUG 2026 · 00:08 UTC
12.7 keys
11.1 keys
31 AUG 2026 · 10:09 UTC
12.7 keys
11.1 keys
31 AUG 2026 · 14:09 UTC
12.8 keys
11.1 keys
31 AUG 2026 · 20:10 UTC
12.7 keys
11.0 keys
1 SEP 2026 · 00:09 UTC
12.7 keys
11.0 keys
1 SEP 2026 · 12:08 UTC
12.6 keys
11.0 keys
2 SEP 2026 · 12:08 UTC
12.5 keys
10.9 keys
3 SEP 2026 · 12:09 UTC
12.7 keys
11.0 keys
4 SEP 2026 · 00:08 UTC
13.1 keys
11.4 keys
5 SEP 2026 · 02:08 UTC
13.5 keys
11.8 keys
Price history in numbers
66 readings since 25 Sep 2025
Over the last 30 days the Kill-a-Watt Barnstormer's sell price ranged from 12.0 keys to 13.5 keys and is up 12.3% after 41 moves. Over a year it ranged from 8.53 keys to 18.1 keys (up 4.9%). Today's 13.5 keys sits in the middle of its range: the lowest we have recorded is 8.53 keys (29 Jun 2026) and the highest 18.1 keys (22 Dec 2025). The price has moved 64 times since we began recording it — about once every 5 days.