Cheap kiddie pools can be used too and this time of year they are usually on sale. Ive never paid more than $11 for one. I have them in several sizes and just lift up one side to dump the water out except for the largest ones, those I have to empty with a bucket.
Egg chel, I have a few of those kitty pools but I have had them for 3 years and they are dry rotting and busting from being used so much.I personally like the kitty pools because they are easy to clean move,and they were only about 10 $$ at wallmart for the smaller ones. But I will be on the look out for some big one's.
This is a really good time of year to go buy more kiddie pools to replace old cracked ones. Stores like Rite Aid usually sell them really cheap in the fall to clear out their inventory.