I think they should require the ad because of people doing these exact things!  Someone posted about a week ago that her neighbor would tell Walmart that a grocery outlet had a product priced lower than what her coupon was for so she would have moneymakers.  Example: fruit snacks are $2.50 and she had a .55 off coupon.  She would say a place had them for .47 cents and make money off of it.  It’s so sad that people take advantage like this.

 This is from Walmart’s price match policy! Just an FYI!
*The following are guidelines and limitations:
We will match any local competitor’s advertised price.We do not require customers to have the ad with them to honor a competitor’s ad.Items purchased must be identical to the ad (size, quantity, brand, flavor, color, etc
They do not have to have the ad. Thanks guys!

That does not mean they are not going to fight you on it. I had two clerks and the CSM tell me they would not PM without an Ad. I gave her my Walmart policy and she said its a new policy, and then I pointed to the one hanging from the check stand and she STILL argued with me. Its when I asked to see the manager that she finally caved. She left with a remark on how she didn’t understand why I was arguing over .18 cents.