canonical product

Callaway Big Bertha B21

Iron Set · Ultra Game Improvement

14
live listings · 5 retailers: $407–$1,165
asking range: $713
fair, all conditions · 7 comps: ~$555 · 4d
clears at · 8 organic delists (180d) · delisted ≠ sold

buy now or wait?BUY

The value curve is flat — waiting buys you almost nothing.

≈ $2/mo depreciation (model)clears ≈ $555 (measured · delisted ≠ sold)

copies that clear organically do so quickly (measured) — good examples don't linger.

forecast: product evidence · verdict recomputed nightly

The verdict

each line cites its basis

Buy window: the cheapest live copy sits $306 under the all-condition fair bar. — fair $713 · 7 comps
Sellers ask ~$41 over what actually clears — offers near $555 are market-typical. — 8 organic delists, 180d · delisted ≠ sold

What it has been selling for

monthly medians since 2026-01

monthly median ask · open points are sparse months (<8 observation days) drawn as facts, never interpolated — the line knits itself in as nightly snapshots accumulate

Value over time

value model, curve fit on this product · 68 obs

$474–$760
typically sells for: −4%/yr
value trend: 81%
held over 3 yrs

median model value by product age, 80% band — about 1 in 5 sales lands outside it · rebuilt nightly

Fair price by condition

Average5 comps: $713

own one? check what it's worth →

Same band, for less

measured comps

Heads rated to the same Ultra Game Improvement playability band, priced materially lower at fair — each fair on 5+ comps, each buyable today. Ranked by what you save, weighted by how well-measured the saving is. Nothing here is paid placement; there is none on this site.

Live listings

cheapest first · 14 live