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Live · checked today · 3 UK retailers tracked
Callaway B21 Driver vs Mizuno ST-G 440 Driver
Quick verdict
Checked daily across 3 UK retailers
Price and availability verdict
Callaway B21 Driver is currently £169.95 used, while Mizuno ST-G 440 Driver is currently £169.95 used. Against tracked history, Callaway B21 Driver is at its lowest tracked price and Mizuno ST-G 440 Driver is 19% above its lowest tracked price. Callaway B21 Driver is currently available from 1 UK retailer, versus 3 for Mizuno ST-G 440 Driver.
Deal intelligence
Should you buy now, or wait?
The Callaway B21 Driver is at its lowest tracked price today. The Mizuno ST-G 440 Driver has more room: its tracked low is £199.95.
Callaway · B21 Driver
Not enough data yet
Today £169.95 · typical £199.95 · lowest £169.95
Mizuno · ST-G 440 Driver
Not enough data yet
Today £237.95 · typical £279.95 · lowest £199.95
On sale 2 times in the last 3 months
Head to head
Category leaders, from the data on this page
- Cheapest new B21 £169.95 vs £237.95
- Closest to its tracked low B21 0% above vs 19%
- Most retailers in stock ST-G 440 3 vs 1
Where to buy
3 UK retailers, checked daily
Price trajectory
How each has moved since we started tracking
Lowest tracked price per day, any condition. Caddence tracks both daily. Shaded spans are days we couldn’t collect prices — the lines break rather than guessing.
Callaway · B21 Driver
↓ £30
since 9 April 2026
Lowest £169.95 on 18 August 2026
Mizuno · ST-G 440 Driver
↑ £11
since 9 April 2026
Lowest £199.95 on 24 July 2026
New vs used
From used listings we track
Callaway · B21 Driver
NEW £169.95
USED FROM £169.95
Mizuno · ST-G 440 Driver
NEW £237.95
USED FROM £169.95
Used prices average 92% of new · 3 used listings tracked
Availability by build
Which configurations are in stock right now
| Build | Callaway B21 Driver | Mizuno ST-G 440 Driver |
|---|---|---|
| Extra Stiff · 9.5° · Used | — | 2 retailers · from £169.95 at Replay Golf → |
| Regular · 9° · Left-hand · Used | 1 retailer · from £169.95 at Replay Golf → | — |
| Stiff · 9.5° | — | 1 retailer · from £237.95 at Replay Golf → |
| Stiff · 9.5° · Used | — | 1 retailer · from £239.99 at Mega Golf → |
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Common questions about the Callaway B21 Driver vs Mizuno ST-G 440 Driver
Prices shown are the cheapest in-stock price per retailer tracked by Caddence, updated daily. Always confirm the final price on the retailer's site.