Since you're in the US, I recommend Higgins Brothers. I have a set of entry level composite clubs of theirs that I've been very happy with, as well as a number of their bean bags. As for ebay, you always run a gambit there. There are definitely good beanbags there. As I'm writing there's a set of four Dubé balls up for sale at $20, which is not too shabby. Make sure they put the brand, and stay away from anything in bulk; those are never any good.
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-James
"How do you know if you're happy or sad without a mask? Or angry? Or ready for dessert?"