via Fabulous Savings

Hundreds of well-known online stores like Barnes and Noble, Staples, and Overstock.com have a place within their shopping cart for a “coupon code” that gives a percent or dollar amount off your purchase. If you don’t know the code, you can’t take advantage of the discount. You can find these secret discount codes and coupon codes listed on many sites across the internet…
Source: currentcodes.com

First, online promotional codes, online deals…

• Free coupons, coupon codes, online coupons and promotional codes - Coupon Cabin
  If you search for Kohls coupons, visit this website. There’re also Loft, Target, Zappos, Office Depot, Nike and many more coupons.
• It’s Fun to be Naughty - Naughty Coupons
  “Online stores send out discount codes to SELECT groups of customers, leaving the rest of us to pay full price! To that we say, NO! We find and list ALL of the coupon codes and promotional codes that can be found.”
• Coupon Codes for Thousands of Online Stores - Retail Me Not
  RetailMeNot.com is an easy way to find online coupon codes. Enter these codes at the checkout page of participating merchants for instant discounts.
• Coupon Codes and Online Coupons - Coupon Heaven
  Online shoppers can save time and money through this comprehensive database of coupon codes and promotional offers.
• Coupon Codes, Promotional Codes and Discounts - Current Codes
  “Many ask why we don’t list deals and sales for the stores in our database. We choose to focus our attention on coupon codes only, because our mission is to have absolutely the best coupon code database on the Internet.”
• Online Shopping Bargains - Shopping Bargains
  Easy online shopping in one place. Shop by department, store or coupon.
• Dell Coupons, HP Coupons, Computer Deals - Coupon Mountain
  Find free coupon codes, bargains and sales from more than 2,000 online stores.

Second, store coupons…

• Free Printable Retail Store Coupons - Wow Coupons
  Choose your discount, print it out, and go shopping!
• Free Retail Coupons and In Store Printable Local Coupons - Flamingo World
  Retail printable coupons help you save when you shop locally. Print these coupons and go shopping!
• All Store Coupons - Mom’s View
  This page is updated daily.
• Grocery, Baby Products, Footwear, Supermarket Store Coupons - Thokalath
  Print coupons from leading companies nationwide that you would ordinarily make purchases from. Save money on brand name products.
• Buy Direct from the Manufacturer - Outlets at Casa Grande