have you tried calling them?
http://www.petco.com/content/locator/Search.aspx
http://stores.petsmart.com/
only down side is shipping is $25 i believe. i get mine local for about the same price just no shipping which is really nice.As far as online is concerned, Drs Foster & Smith charge around half the price of either Petsmart or Petco (in my area) for the SFB brand.
have you tried calling them?