These are sites that have coupons that you can print off right from your computer.
These are sites that feature different products for short time periods at heavily discounted prices. You have to sign up to buy, but you usually get a credit for signing up.
Discount Voucher Sites
These are sites that sell you vouchers for various products and services at a heavily discounted price, usually between 50-80% off the original price. You have to sign up to buy but you usually get a credit for signing up.
Smart Phone Coupons
These sites allow you to download coupons onto your smart phone for use while you are out.
Cash Back Sites
These are sites that pay you for shopping when you click through their links to stores.