Many people are familiar with the Entertainment books.  You purchase a book that has deals in your area and then tear out and use the coupons you want, and hope that it will pay for at least the price of the book.  Well, Saveology has a deal similar to that available for only $3.  For $3 you will get $100 in credit at  I purchased this deal a few weeks ago.  Here is how it works:

Once you purchase the item you will receive an e-mail (mine came about 3 days later)
You will log in to your account and then enter your zip code.
It will then show you not only dining coupons available, but also shopping coupons.
Here is one example:
You want to go to lunch at Subway, so you look up dining coupons.  Each coupon is valid for a different discount, i.e. buy 1 sandwich get one free or 20% off.  Each coupon has a dollar amount associated with it.
Once you choose a coupon that dollar amount will be deducted from the $100 in credit that you have.  You then print out your coupon and take it to your local store or restaurant.

I already printed out a McDonald's coupon for a free sandwich, so it has already paid for itself!