WANTED - AMD Athlon 64 x2 Processor

[Si]

My rig at home was underpowered when I built it over 3 years ago but now, well, I'd love to give it a boost with faster processor and prolong its life a little longer.
 
It has a AMD Athlon x2 4200 processor inside it and I was wondering does anyone have anything like the 6000 series (which runs at 3Ghz+ )? I'd even give you some money for it
 
Something like this:
 
http://cgi.ebay.co.uk/AMD-Athlon-64-X2-6000-/260686252538?pt=UK_Motherboards_CPUs&hash=item3cb21c89fa