Bulk training treats (no chicken)

I have an old stubborn dog who learns slowly (but he does get there!) We go through a lot of treats. I like the training treats because they are already small, and he's already a big guy. The issue is the smaller the treat the more expensive they seem to be! Does anyone have any go-to treats or brands that you use frequently that can be a good bulk deal? (My guy is allergic to chicken)