I just use a large flat seal-able tub that I bought at the dollar store. It's intended use was probably food. The acetone doesn't eat these. I can put 8 or 10 buggy wheels in at a time. Here's a walkthrough of how I do it:
WHEEL SALVAGING TUTORIAL
It's probably worth buying a few similar containers, and testing if the acetone eats it or not. For the record, I've never had a food container react poorly to acetone.
(however, cleaning brushes in a plastic/disposable drinking cup, that's another story. :P)