The Walmart company has a very specific coupon policy. They accept print-at-home coupons, manufacturer's coupons, and competitor's coupons. They don't accept coupons for a percentage or price off of an entire order. They also do not double coupons.
Walmart will honor competitors coupons as long as they meet certain criteria. The walmartstores.com/7655.aspx page offers a downloadable copy of their coupon policy. Also, http://www.ehow.com/how_5028939_walmart-meet-competitors-price.html has some additional information about Walmart's coupon policy.
Walmart does not have a coupon program rewards program. They do however always have some great prices on their products. You should just be happy with that.
There are a variety of websites that state they offer coupons for different stores and products. These sites often have coupon codes or offers that work, but sometimes these offers are expired or do not work. To the best of my knowledge you can not purchase a coupon for Walmart. Here is a site that has some Walmart coupon codes: http://dealspl.us/walmart-coupons
Most drive throughs don't take coupons, but some do. Try contacting the restaurant to chack their specific policy, or look on the coupon to see the terms.
In Canada there are very few stores that offer an overage when using a coupon. WalMart does offer overage and Target their main rival, but new to Canada, also offers overage. There are some stores however, that do not offer overage since the policy is sometimes left to the manager's discretion.
First, you will need to look at the coupon to make sure that it can be doubled as a lot of coupons do not allow anything but the face value of the coupon. Second, you will need to check the coupon policy for your Kroger store. Every region differs and while most do offer double coupons still, some only double up to a certain price.
When purchasing a single item at Staples, you have two options. You can use an in house coupon, or a manufacturers coupon. At some locations you can use them both, but you will have to check the store policy to make sure you can.
You can generally find a running warehouse discount coupon on one of the discount coupon websites. So many of these coupon sites are springing up because everyone is looking for a bargain. Some cannot be used in conjunction with other offers or reductions, so do check the terms on each, but a running warehouse discount coupon will certainly save you money on many of their products.
Not all stores will accept all printable coupons. Some coupons will still be store specific while some stores have strict coupon policies. See the stores coupon policy before wasting printer ink and paper.
You can find some coupon codes for Swanson vitamins at either their website or at various coupon code websites.
In your insurance policy there is a section called terms that will explain all the terms like what you are talking about.
Retailmenot, coupon-hub, Groupon, buxoff.