There is a trend that is starting in which stores offer you an incentive for your feedback on your shopping experiences. Check the bottom of your register receipts to see if there is an offer for future savings if you call in and answer a few simple automated questions. Right now I know that Bath & Body Works in EP offers this on all of their receipts and have for several months. It used to be very random and now it is with every receipt. If you call in an answer a few questions you are given a code to write on your receipt and then you are eligible for $10 off your next $30 purchase. This offer DOES NOT expire which is awesome when it comes to needing a few gifts at the holidays! When you use these coupons you can check out multiple times in $30 increments in order to use more than one of these coupons. I have even seen these coupons for sale on eBay where a lot of 5-7 coupons would go for about $25-$45.
Mastercuts also uses this method. Again, you call in and offer your feedback to an automated machine and you are given a code that allows you to save $2.00 off of your next service. The coupons says that the offer is good for 45 days from the date of the receipt, but I don't think they keep track of that. You can use multiple coupons at one time with no problem at all.
Cub Foods occasionally will have an offer at the bottom of their receipts but no one there will draw your attention to it. Again, you call in and offer your feedback and in turn you get a free loaf of french bread on your next visit. That's a $2.99 value.
I know that other retailers are anxious for you to call in or log on to their website to offer feedback with no incentive. If you really like the retailer and plan to continue buying from them, you might consider calling in and asking that they offer a discount for your feedback. It might work!