If you are looking for a Windows XP Professional License but can't seem to get it at the right price, buy Windows XP License for £65 and get a free IBM computer delivered for free.
The IBM Thinkcentre desktop is a slim small form factor computer that comes with a Pentium 4 2.66GHz, 512MB RAM, a 40GB hard disk drive, a DVD ROM and a 3-month return to base warranty.
There's also a 10/100mbps NIC, 4 USB Ports and built in sound module. Note that there's no cables, keyboard or mouse. Furthermore, you will get a Win XP Pro License, OS is pre-installed but no Restore Discs are supplied.
This is a very capable computer that will withstand any mundane tasks like surfing the internet or basic web processing. Unfortunately, if you try to upgrade it you will almost certainly face a number of difficulties.
The price of DDR memory for instance has crept up after it was phased out. The processor cannot be upgraded to a much higher speed.
Note that this is a refurbished computer and stocks are extremely limited. Buy it from Bigpockets for £65 and get it delivered for free. You can find other similar tech deals at ITProPortal.com's Price Comparison website.