Here are a few cool shopping-aide sites. They have links pointing you to coupons (both online codes and printable ones), free deals, etc. These sites are great if you order stuff online. Chances are you can find a coupon code for $5 to $50 off sites such as Amazon, Officemax, and more.

Slick Deals - www.slickdeals.net
Amazing Bargains - www.amazing-bargains.com
Flamingo World - www.flamingoworld.com


Some others I rarely use:
eBates - www.ebates.com note: never got credit for the discount
Coolsavings - www.coolsavings.com
Yahoo Internet Life Freebies - www.yil.com