How about a useful tip: you can return nearly anything at Walmart. Did you buy the wrong shade of concealer? Is that bottle of shampoo not living up to the hype? Are you appalled by the flavor of your toothpaste? Even without a receipt, Walmart will award store credit for the current price of the item.
Walmart's return policy states that you can only make three no-receipt returns within a 45 day period, so this is certainly not a system to abuse. But it's nice to know that, if you're debating whether or not to try a new product, you can always make the purchase at Walmart and return it if you aren't satisfied.
Thanks for the insider info, Amber!