eBay with Bullseye Deals has the Threshold 500 Thread Count Breathable Smooth Sateen Weave Deep Pocket Sheet Set (Twin/Twin XL, Full, Queen, or King) for $16 - 20% off with coupon code SUMMERHOME20 [Exp 8/31] = $13 with free shipping. Made with a 52% Cotton, 31% Polyester, and 17% Lyocell blend.