Here is the official Walmart Coupon Policy:
Walmart Coupon Policy
Walmart accepts the following types of coupons (see guidelines below):
- Manufacturer coupons (Cents Off)
- Free merchandise (or manufacturer’s 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.
Source: Walmartstores.com