Community price on backpack.tf: 60.0–65.0 keys, last changed 2024-04-09 (2.4y ago). The live quote above, 9.57 keys, is 84% lower and last moved 3h 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 1h ago.
Steam Market asking price: $280.00 — the lowest of 2 listings for the Sulphurous 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 9 keys, 36.11 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
22 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.
Sulphurous Barnstormer sell price, 2025-09-25 to 2026-09-05: 22 observations, from 66.9 keys to 9.57 keys.
Observed (UTC)
Sell
Buy
25 SEP 2025 · 03:29 UTC
66.9 keys
50.6 keys
30 SEP 2025 · 20:41 UTC
65.8 keys
50.5 keys
9 OCT 2025 · 08:24 UTC
62.9 keys
53.1 keys
19 OCT 2025 · 20:11 UTC
59.8 keys
50.5 keys
25 OCT 2025 · 16:31 UTC
57.0 keys
48.2 keys
10 NOV 2025 · 00:32 UTC
58.5 keys
49.4 keys
23 JUN 2026 · 07:14 UTC
30.0 keys
26.1 keys
29 JUN 2026 · 01:14 UTC
31.6 keys
27.5 keys
5 JUL 2026 · 23:12 UTC
29.5 keys
25.6 keys
12 JUL 2026 · 22:44 UTC
30.0 keys
26.1 keys
19 JUL 2026 · 22:44 UTC
31.3 keys
27.2 keys
29 JUL 2026 · 16:44 UTC
31.7 keys
27.6 keys
1 AUG 2026 · 06:43 UTC
32.8 keys
28.5 keys
11 AUG 2026 · 15:12 UTC
33.0 keys
28.7 keys
21 AUG 2026 · 02:08 UTC
32.9 keys
28.6 keys
23 AUG 2026 · 00:08 UTC
32.9 keys
28.6 keys
23 AUG 2026 · 18:08 UTC
33.0 keys
28.7 keys
26 AUG 2026 · 02:09 UTC
32.9 keys
28.6 keys
26 AUG 2026 · 12:08 UTC
33.0 keys
28.7 keys
1 SEP 2026 · 10:08 UTC
32.4 keys
28.2 keys
1 SEP 2026 · 14:08 UTC
24.5 keys
21.3 keys
5 SEP 2026 · 14:08 UTC
9.57 keys
8.32 keys
Price history in numbers
22 readings since 25 Sep 2025
Over the last 30 days the Sulphurous Barnstormer's sell price ranged from 9.57 keys to 33.0 keys and is down 71.0% after 8 moves. Over a year it ranged from 9.57 keys to 66.9 keys (down 85.7%). Today's 9.57 keys sits at the bottom of its range: the lowest we have recorded is 9.57 keys (5 Sep 2026) and the highest 66.9 keys (25 Sep 2025). The price has moved 21 times since we began recording it — about once every 16 days.