Not Amazon but Target--I *love* the Threshhold performance sheets, even moreso than the expensive ones I got at BBB years ago. Super soft out of the bag, extra deep but with a second row of elastic halfway down for thinner mattresses, and hidden tags on the fitted sheets that tell you what's the side and what's the top (especially useful for king sheets). And they wrinkle a TON less than standard sheets, but they are still 100% cotton. I don't how what magic goes into them, but they are the best sheets I've ever owned, and cheap to boot.
http://www.target.com/p/threshold-performance-sheet-set-solid/-/A-16248496#prodSlot=medium_1_2&term=performance+sheets