3 Level Large Animal Condo Petsmart (store only, not online) - $129.99 RattyRat's Review: This was the largest cage we could find at any of our local pet stores that had bars close enough together to be suitable for the smallest of baby rats. It's dimensions were around 3.5' wide x 2' deep x 3' tall. This cage was fair, however given a choice, a Martin's cage is a much better buy. This cage's base didn't come off making it very difficult to clean, and it was a lot of money for a not so big size. Martin's cage's are better constructed, larger for the money, much easier to clean, and more durable than this cage.