My BP weights 546grams, and I have been feeding him/her frozen rats that weighted 61grams. I want to buy in bulk so I can save in money since the only place I can get frozen is at petsmart and at $14 for 2 rats that's crazy. So my first question who do you guys recommend to buy in bulk? Also the size rat I am feeding right now, is that a good size or should I bump up?