The cheapest way to get XP is to get the OEM edition but you have to buy some hardware with it in order to qualify for the reduced price. This isn't a major problem as you can buy a mouse, keyboard, memory or other such item, details are on most of the websites. I was just looking this afternoon at the suppliers I have used for Windows XP Home OEM edition and found that the cheapest were Komplett at £58.00, Novatech was £60.63 and Scan was the cheapest at £55.78. I'll be using either Novatech or Komplett mainly because I'm needing new memory and Scan doesn't have the make I want. The only thing I'll have to check is postage costs as that can make the price increase significantly.