DW = Dear wife
I buy a wal-mart GC at wal-mart with my Visa 5% card. DW then uses the wal-mart GC at Sam's.
that doesnt solve the only carrying one card. so instead of carrying your visa card which you wont need anywhere, youll take your walmart GC everywhere, thats still 3 cards (amex, MC, and WM GC.)
and now that u mention it, good idea! never thought of it. i spend a lot of money in sams and no rewards for it because i use a debit