Shipping is really expensive for me too otherwise I'd order frozen off the bat. But now that I have such an array of sizes of snakes, it seems like it should be a good idea to breed. Most other threads are dealing with people breeding to have the little rats to feed. I just want to know if it is worth breeding them because I'd have to wait until they get up to a medium size to feed half of my snakes. And if so, what size rat should I get to breed? Jumbo?