I've had Wal Mart print out some custom cards (well, 4x6 custom photo prints) for me before. I had to sign a waiver saying they were mine to print. As long as you do that, there's no issue having Wal Mart print things for you. You can actually order them online to pick up in the store, print the paper at home and fill it out, then take it with you when you pick them up. Shouldn't be any problem whatsoever, unless you're dealing with a moron that doesn't know their own policy or wants to pretend they have real power.
It's All About Collecting The U : 202 different Miami Hurricanes totaling 4,185 cards