While not on the magnitude of flytoeat's recent purchase, I took advantage of a great offer at Sam's club today: They have been giving out coupons at the door during the month of February - the coupon which is valid today through Sunday is Buy One, Get One Free for the three pack box of NutriGrain Bars. These boxes have 300 miles per box.

Thus, spend $6.99 and receive 6 boxes, or 600 miles. Works out to 1.165 cents per miles. And that's before any tax deduction.

Was able to talk my wife into going back into the store so that we could each use two coupons - for a total of 2400 miles for $27.96. The back of the coupon says one coupon per transaction, so I don't think you can combine them - so you would have to keep getting on line again if you really wanted to rack up the miles.