We have had a credit card from American Express for a number of years.  Recently we changed our membership at Costco and received the American Express Business card.  It comes with many, many perks. 

We always purchase our gasoline at Costco, due to the lower cost.  We even drive several miles out of our way to do so.  We now have the added benefit of a 3% rebate at the end of the year in the form of a Costco voucher for our purchase.

We also purchase groceries and many other items at Costco, and again receive a rebate at the end of the year.

We travel a good deal and the 5% rebate on travel...