Ebates

Ebates is a cashback website offering rebates on purchases through over 1,800 stores.  They also have over 10,000 coupons available to those use at those stores.  Purchases can earn up to 40% back depending on the store.  You may select payment via a quarterly check, or through PayPal.

History:
As one of the oldest and most trusted cashback websites, Ebates launched on May 3, 1999 and quickly gathered 100,000 hits per day.  Members were reported to have spent $2.2 billion using Ebates in 2013.  Ebates is now owned by Rakuten, Inc.