NONONONONO
Acetone and ABS make ABS Cement, which is NOT bondo. ABS cement is good for fusing plastics together. However, it looks like utter crap when sanded.
Bondo is good for filling in gaps after you've used ABS cement, or for joining parts together if you don't have or don't like to use ABS cement. It's a bit brittle though, so you might want to keep its use to a minimum.
As for the original poster's question, Walmart or Home Depot.