I'm a little curious, why did you regret your purchase? I've been tempted to purchase a pair of Star Wars themed Addidas sneakers as I'm a bit of a sci-fi geek ha ha. Mind you I don't think I'd be brave enough to wear the el dorado star wars edition as they'd probably draw too much attention.
Anyhow, your question hmm... I've only regretted one purchase, purple Addidas hi tops. They weren't all that expensive but I don't know what I was thinking as they are so "loud" that I never wear them, they just sit at the back of my closet ha ha.