I was at Home Depot today and was looking around, and found those shower floor replacements. They carry some that are only like 33" by 33", so it would have to be for a larger cage, or maybe two small ones. Anyway, there is a slight slope that leads to a middle hole. Not super heavy but good and thick with probably a 1 1/2 to 2" lip, water proof (obviously), and has the slope built in. If you put some legs on it or added a base, it can empty right into a bucket. They were 79$ here, so probably wouldn't be worth it for a lot of cages. Anyway, I'm considering trying one out in one of my enclosures...I'll let everyone know how it goes if I do.
