Like jay said above, you can find some used Athlons or Phenom for this price. BTW, you shouldn't get single-core processors, especially AMD ones lol. This is a good deal, for a tri-core Phenom (if you're in the UK):
http://www.ebay.co.uk/itm/AMD-Phenom-II-x3-710-2-6GHz-Tri-Core-Socket-AM3-6MB-HDX710WFK3DGI-Ship-from-UK-/271825171715?