I can see plenty of Forerunner 220 on eBay (used) going for £50. If you liked it it's probably a cheaper replacement than something brand new.
(Obviously a gamble if there is a problem with batteries.)
Another option is asking Garmin how much it would be for a refurbished replacement (assuming you send you old one in). That's how I got my latest HRM-Tri belt for half price when the old one died from 3 years of (ab)use.
I can see plenty of Forerunner 220 on eBay (used) going for £50. If you liked it it's probably a cheaper replacement than something brand new.
(Obviously a gamble if there is a problem with batteries.)
Another option is asking Garmin how much it would be for a refurbished replacement (assuming you send you old one in). That's how I got my latest HRM-Tri belt for half price when the old one died from 3 years of (ab)use.