Here's my idea. Take a large Rubbermaid tub, cut a large hole in one of the small ends, and on the opposite end, glue on a large piece of eggcrate foam or upholstery foam. Then, every few inches along the inside, run a string across the top and hang some fleece over it. Cut the first few into strips kind of like a car wash roller. It might be good to put some weights on the bottom of the pieces too. Anyway, the fleece should slow the ball down pretty gradually and let you recover it.