This is definitely useful information to be aware of. If you'd like to print it off so you can carry it with you (as I always do!), here's a direct link to the Walmart corporate coupon policy.

Walmart accepts the following types of coupons (see guidelines below):

• Manufacturer coupons (Cents Off)
• Free merchandise (or Buy-One-Get-One-Free) coupons
• Store coupons
• Pharmacy (Advertising and Promotional) coupons
• Internet coupons
• Soft drink container caps

The following are guidelines and limits:

• Walmart only accepts coupons for merchandise we sell and only when presented at the time of purchase.
• Coupons should have an expiration date and be presented within the valid dates. Walmart will not accept expired coupons.
• Internet coupons should be legible and say "Manufacturer Coupon." There should be a valid remit address for the manufacturer and a scannable bar code.
• Only one coupon per item is permitted.
• Use of 40 or more coupons per transaction will require approval by Customer Service Manager.

Although it's not explicitly stated here, in my experience, if your total savings are more than 50% off your total purchase price, your transaction will require approval by a Customer Service manager as well.