Big Cheese is pretty good. My only problem with them was I had one snake, and buying bags of 25. My snake was growing fast, and I felt like I was ready to move up in prey size before I ran out. I fed two rats per feeding a time or two, which isn't that big of a deal really. Underground Reptiles sells in smaller quantities and their feeders were pretty decent. No complaints here. Depending on how many and of what size I need, If I can't get to a local expo, Big Cheese is my first choice, followed by Underground Reptiles.

I've heard others are good also, it's just the shipping you have watch out for. I'd say check out a few and find out what shipping to your area is, and go with what you feel is best.