If you live anywhere near an IKEA check them out. At least in the US their fabric prices are fabulous. I've also purchased discontinued sheets there when they went on sale. I bought a king size set a few years ago and am still using fabric from it. It came with two pillow shams and two sheets ... LOTS of fabric! I think I only paid $10 US but it was a few years ago and it was on a deep sale price. Here's a link to a UK location:
http://www.ikea.com/gb/en/catalog/ca...extiles/10655/