Bought 250 rounds of 45acp, 100 rounds of 357magnum and 50 rounds of 38 special. All with nothing but my bank debit card. All done here at my local Wat-Mart lastnight.
I think it really depends on what Walmart you go to. I bought 9mm there before I even got my CC because I used it for my Hi point Carbine. Only thing I had to show them was green.