I hate to say it, but there's a lot of fake Seven's on Ebay. I would suggest trying a discount store (Marshalls, Filene's Basement, TJ Maxx) and seeing if you could get some there.
If you do use Ebay:
*Check buyer's feedback.
*Only buy from a buyer with Public feedback
*I don't know how to tell fake sevens, but if you google it you should be able to find out.