Ok thanks guys!

My problem is that I really can't breed mice/rats because I'm at college, and technically I can't even have a snake here, haha so breeding rats are out of the question.

I know this one place close by that sells live rat pups and adult rats, but I can't remember what else.

What sizes do rats come in? I know for mice its pinkies-fuzzies-hoppers-adults, but what are the technical terms for rats? I just want to get a general idea of what the different sizes of rats there are so I don't sound like an n00b when I go into the store .

Thanks again.