Guess I'm the lone ranger on this one. I typically tell people to start looking at their local grocery store and then branch out to other options (Asian markets, online vendors, etc.) if they can't find what they're looking for.
Frankly, I just buy the least expensive non-enhanced meats for my furbabies. If I have a choice between antibiotic and hormone-free, that's what I'll go with, but if not, so be it. ALL the meat and stuff that ends up in a commercially-prepared product comes from the same original animals that my grocery-store bought meat comes from - or worse - and is always the un-fit cuts, etc. So, no, I'm not sweating this.
For what it's worth, my beef kidney and chicken liver always comes from my local Stop & Shop (availability and price, respectively). If they have chicken wings on sale, I'll buy those, too. My turkey drumsticks, chicken quarters, gizzards, chicken breast with ribs, and chicken wings (usually) comes from my local PriceRite (lowest price and availability), while my beef and pork come from the closest BJ's (lowest price). I buy my duck, chicken and turkey hearts, turkey liver and rabbit pieces from Hare-Today
'cause the price is decent and I can't get them anywhere else.
I get my crickets from the local PetCo.