I just finished going through this exercise myself. Not sure of the craft store route for finding felt. I went to Patricks to see what they had. They had a felt replacement kit for $29 which included felts for both boots. I found the same kit at Hook and Hackle on the internet for $15. It includes felt for two boots and goo to apply it with. Haven't had my boots in the water yet, but the fix seems to be pretty solid.