FTD is currently running a promotion in which you can get 1500 Delta SkyMiles per order. To get the deal, go to FTD via this link: ftd.com/deltasky20.
It’s possible to optimize this by finding the cheapest items with the lowest delivery fees. The best I could find were bears and cookies:
I Love You Message Bear by Build-A-Bear Workshop®
Mrs. Fields® Mother’s Day Bites Box
Each of these is $19.99 with delivery as “low as” $10.99. All-in, each item comes to $30.98. Using a miles earning credit card to pay, you’ll earn 31 miles on your card plus 1500 miles from FTD. The total cost per mile comes to almost exactly 2 cents per mile even if you don’t care about the bears or cookies. While this isn’t the best deal I’ve ever reported, it’s not bad!
-Hat tip to MCB via Twitter