ShopBop has some bracelets in their selection. I don't recall seeing any individual charms (I could be wrong, I looked a lot of places!) but I know for sure they have the "special" bracelets. I ordered the 'Jet Set' charm bracelet the other day and at check out I used the SAYJUICY code I read about on here for a 20% discount! You might check them out and see if they have anything your looking for.
Oh and PS. through Dec. 14th you can use the code 'BRIGHT' and get a 20% discount at Bloomingdales. I know Bloomie's always has a nice selection of charms!