Couponing seems to be all the rage these days, but most people don't have time to clip, snip, and binder-organize hundreds of coupons a month (and, really, who wants 25 boxes of frozen fishsticks just because they're on sale?). This is a way to get on the couponing bandwagon without a ton of work and with only some simple math and good planning.
Here are the steps:
1) Look for a product that is being sold as a "buy one, get one free" deal. Say you find a bag of apples that's $4, buy one, get one free.
2) Find a separate offer for money off the same product. Say, $2 off the same bag of apples.
3) When the apples are scanned, they will be recorded in the computer at the discounted price (in this case, $2 for each $4 bag of apples because one is free)
4) When the $2 off coupon is applied at the end of the transaction, you'll get the apples for free.
Bonus: if the coupon is worth more than the discounted product (say, if the coupon off apples was worth $5), most supermarkets will give you money back -- you would be paid 3 dollars to take the apples home.