I've never actually seen a store that sells them. I would try converse.com, I'd imagine you can order them off of there.
If you have a Journey's in your mall, that's the place to go.
Ebay :D or this site - http://funadvice.com/r/3l9dtk0j7b
hot topic, spencers, journey's and place like that :D
Journeys or the converse store.
try [link removed]