At the Grocery Outlet in Elizabethton they have a HUGE box full of 600 thread count sheets in a variety of colors and all sizes for only $20. It comes with a fitted sheet, top sheet, and FOUR pillowcases! I had to try it myself and even after a few washes, the sheets are still luxuriously nice!
I just bought a set for my mother in law and I encourage anyone who needs sheets to go here too. You'd spend more than this on 200 thread count at Walmart - so check it out if you get out that way!