Diabetes Friendly US Dog Biscuits and Crunchy Treats(From Chewy)
That might help.I definitely wouldn't completely rule out things including meat though,as it isn't harmful and in many cases can be sourced fairly ethically.
Just be sure that the company behind any product is reliable and the ingredients are 100% safe.If in doubt,ask about specific products or brands and you can definitely get extra help if it happens to be a product outside of that list(as new products do pop up on Chewy,and there are other categories to choose from with the same brands and more!).