Many stores now offer one-step rebates. This is where all of your "store coupons" and "rebates" are tracked through the store's loyalty card and you are issued a single check in the form of a rebate. You can apply coupons to the items as you purchase them, essentially "stacking" the deals. It's important not to be deceived in this area. The rebate check is wonderful, but only if you have already purchased the item at a lower price. If it's not at a discount before the rebate and coupon, it might not be a "real deal" and you can think you are getting a deal when actually you are paying a higher price.
You can visit Grocery Coupon Guide