While signing up for the Q3 5% gas rebate program, I looked at the cash back rebates at Shop Discover--in many cases, they are higher than I remembered, and in some cases, much higher than competing rebate programs. For example, the 5% cash back on Dell or Bestbuy.com. To see the whole list, you will have to log in at Shopdiscover.com, but here are some of the more popular ones, in each one below, the rebate % is at least 1-2% than the best offer out there that I could find, and in some cases, much more than that.

www.shopdiscover.com

Dell Home 5%(Most other rebate portals max out at 3%)
Best Buy 5%
Circuit City 5%
Office Max 5%(not even listed on evreward)
Office Depot 5%
B+N 10%
FTD 20%
Underarmour 10%
Nike 10%
GNC 15%
Apple Store/itunes 5%
Hotwire 5%

1) You need to have a Discover Card and use it to pay for the purchase. Do a search if you want to get one, there are numerous sign up offers.

Here's one, with $100 cashback after your first $500 in purchases:

http://forums.slickdeals.net/show...dis cover

2) You need to link through the shopdiscover site. You should get this rebate in addition to the normal discover rebate. Read specific retailer terms and conditons before linking. Shop discover FAQs

http://www.discovercard.com/custo...cover.html

3) If you are looking to max out your cash back rebate on a specific transaction, there are many comparison sites, I use www.evreward.com, although evreward actually does not list shopdiscover rebates but feel free to suggest any others.