I only ever saw this at a couple of bookstores that were adept at importing publications. Supermarkets had the usual Gamefan, Gamepro, EGM, etc.
I agree, the EGM spin off mags were just regurgitated/reprinted material from the monthly issue - it was almost as bad as the Game Player's Buyer Guide Annuals (that were bad reprints themselves), at least EGM did throw in a couple of new pieces on a game or two though.