Ordering Rodents?

Ok I want to start ordering frozen rats off the internet because Im tired of running to the store. Also my local pet store only carries medium and large rats, nothing smaller and I want to start my guys on rats. So I dont really know the size comparison between rats and mice of the same size. I havent weighed my mice either, I just go by "the widest part of the snake" rule. All 4 of my balls are eatting about 2 small mice every feeding. Would that be the size of the weanling Rats or rat pups on Rodentpro.com? Oh yeah by the way 3 of my snakes range from 190-210grams and the largest was 270grams on empty, if that helps any. Thanks for the help.

I'm assuming you have a scale or something since you know what your snakes weight. Rodentpro lists the weights of each rat size they sell, just weight the size of mouse you normally feed them and purchase a similar sized rat!

Didnt think about that, I feel like a dummy now lol.