Do the Coach stores typically only have what is listed online? I kind would like a charm for my purse (never had one before) but I'm not that impressed with the selection online... would the stores have any "older" charms that aren't listed on the web? Also... could you use a keychain as a charm for the purse? Maybe slide the keychain through one of the straps? Or is that tacky? I've never dressed up a Coach purse before but I'm thinking this black carryall could use a little burst of color.