Hello & Welcome to Just Answer,
Sorry I didn't see your question earlier and to hear of any issue you are having with your device.
I checked and see that Garmin has replacement bands for this device in several colors. and they are usually sold as "kits" - meaning that they come with the spring pins and a tool to remove the old band.
I found multiple colors listed online - on Amazon - and have a link to some search results for you below.
Replacement Band For Forerunner 10 (Amazon search results)
Please let me know what you find or if you have any more questions.
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Thanks, ***** *****