For Walgreens they do it two ways. They have their coupons in the ad and then they have an EZ Saver available in the stores that shows you what rebates are available. You send a form in each month with your cash register receipts and you can either opt to get a check or have it applied to a gift card. If you choose the gift card option, you get an extra 10% and it is automatically added on each month, you don't have to wait for a new one in the mail. You can get a free sale list that tells you what coupons to use and when from www.thegrocerygame.com
. I love it!