I go to Costco quite often but never go down that isle. I know they carry a slew of cartridge razors, but I'd be surprised if they had any good stuff. I'll have to look next time I go.
Some time ago they had the starter kits for a song(IIRC $10). A fella from here went in and cleared them out and offered up the savings to his fellow B&Bers....or maybe it was Sam's Club...