On my last trip to the dollar store I discovered some great deals (duh, right?) ... they had USB extension cords (which I needed), and retractable USB cables (and a few other variations which I didn't need) for just a buck! I've been very happy to find that these work fine ... and I'm real happy to have only spent a buck per rather than the usual nine!
I'm going to be heading back up that way this evening (taking The Girls up to Dojo) and may go snag some extras before they disappear.