I was borrowing a cat carrier since the boys were tiny, and had to recently give it back. They go in for their neutering on Sept. 8, so I need to buy 2 before then (darn them for growing, they can't share anymore!). I am trying to find something sturdy as I buckle it into the car seat but not too expensive. Does anyone have suggestions of brands or stores that sell good carriers for my boys? Also, they are 5 months and around 5 pounds. What size crate do they need?