canonical product

Callaway Big Bertha B21

Single Iron · Ultra Game Improvement

26
live listings · 2 retailers: $82–$155
asking range: $108
fair, all conditions · 18 comps: ~$108 · 4d
clears at · 7 organic delists (180d) · delisted ≠ sold

buy now or wait?BUY

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

≈ $0/mo depreciation (model)clears ≈ $108 (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 $26 under the all-condition fair bar. — fair $108 · 18 comps

What it has been selling for

monthly medians since 2026-02

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 · 105 obs

$91–$148
typically sells for: ≈ holding value
value trend: 95%
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

Average15 comps: $108

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.

Callaway Big Bertha OS 2023

fair $77 · 8 comps11 live from $56

$31 less at fair

Live listings

cheapest first · 26 live

Used Callaway Big Bertha B21 Single 7-Iron - Right-Handed - Regular Flex

ExcellentRegularNext Round Golf

$82

Callaway Big Bertha B21 Single Iron 7 Iron 7° Callaway RCH Iron 45 Steel Ladies Left Handed 35.5in

AverageLadiesLH2nd Swing

$90

Callaway Big Bertha B21 Single Iron 7 Iron FST KBS Max 80 Steel Regular Right Handed 37.25in

AverageRegular2nd Swing

$90

Callaway Big Bertha B21 Single Iron 7 Iron FST KBS MAX CT80 Steel Regular Right Handed 37.0in

AverageRegular2nd Swing

$90

Callaway Big Bertha B21 Single Iron 7 Iron FST KBS Max 80 Steel Regular Right Handed 37.0in

AverageRegular2nd Swing

$90

Callaway Big Bertha B21 Single Iron 7 Iron FST KBS MAX CT80 Steel Regular Left Handed 37.0in

AverageRegularLH2nd Swing

$90

Callaway Big Bertha B21 Single Iron 7 Iron Callaway RCH 65i Graphite Senior Right Handed 37.0in

AverageSenior2nd Swing

$99

Callaway Big Bertha B21 Single Iron 7 Iron Callaway RCH 65i Graphite Senior Right Handed 37.0in

AverageSenior2nd Swing

$99

Callaway Big Bertha B21 Single Iron 7 Iron Callaway RCH 65i Graphite Regular Right Handed 37.0in

AverageRegular2nd Swing

$99

Callaway Big Bertha B21 Single Iron 7 Iron Callaway RCH 65i Graphite Regular Right Handed 37.0in

AverageRegular2nd Swing

$99

Callaway Big Bertha B21 Single Iron 7 Iron Project X Catalyst 55 Graphite Senior Right Handed 37.0in

AverageSenior2nd Swing

$99

Callaway Big Bertha B21 Single Iron 7 Iron Callaway RCH 65i Graphite Senior Right Handed 36.75in

AverageSenior2nd Swing

$99

Callaway Big Bertha B21 Single Iron 6 Iron FST KBS MAX CT80 Steel Regular Right Handed 37.75in

AverageRegular2nd Swing

$108

Callaway Big Bertha B21 Single Iron 7 Iron FST KBS MAX CT80 Steel Regular Right Handed 37.0in

AverageRegular2nd Swing

$108

Callaway Big Bertha B21 Single Iron 7 Iron FST KBS MAX CT80 Steel Regular Right Handed 37.0in

AverageRegular2nd Swing

$108

Callaway Big Bertha B21 Single Iron 5 Iron FST KBS MAX CT80 Steel Regular Right Handed 38.25in

AverageRegular2nd Swing

$108

Callaway Big Bertha B21 Single Iron 4 Iron True Temper XP 95 R300 Steel Regular Right Handed 38.5in

AverageRegular2nd Swing

$108

Callaway Big Bertha B21 Single Iron 7 Iron FST KBS MAX CT80 Steel Regular Right Handed 37.25in

AverageRegular2nd Swing

$108

Callaway Big Bertha B21 Single Iron 7 Iron Callaway RCH 65i Graphite Regular Right Handed 37.25in

Above AverageRegular2nd Swing

$109

Callaway Big Bertha B21 Single Iron 7 Iron Callaway RCH 65i Graphite Regular Right Handed 37.0in

AverageRegular2nd Swing

$119

Callaway Big Bertha B21 Single Iron 7 Iron Callaway RCH 65i Graphite Senior Right Handed 37.0in

AverageSenior2nd Swing

$119

Callaway Big Bertha B21 Single Iron 7 Iron Callaway RCH 65i Graphite Senior Right Handed 37.25in

AverageSenior2nd Swing

$119

Callaway Big Bertha B21 Single Iron Pitching Wedge PW Callaway RCH Iron 45 Graphite Ladies Right Handed 35.0in

AverageLadies2nd Swing

$124

Callaway Big Bertha B21 Single Iron 6 Iron Stock Graphite Shaft Graphite Senior Right Handed 36.25in

Above AverageSenior2nd Swing

$136

Callaway Big Bertha B21 Single Iron Pitching Wedge PW Callaway RCH Iron 45 Graphite Ladies Right Handed 35.25in

Above AverageLadies2nd Swing

$137

Callaway Big Bertha B21 Single Iron 7 Iron Callaway RCH 65i Graphite Senior Left Handed 37.25in

Above AverageSeniorLH2nd Swing

$155