AMD Athlon II X4 620 AM3 processor - $75 shipped. This processor is just a few weeks old. I bought two of these but only intend to keep one. I have the original box and cooler. It is still in one of my computer towers being used.
Here are the specifications at newegg:
Newegg.com - AMD Athlon II X4 620 Propus 2.6GHz 4 x 512KB L2 Cache Socket AM3 95W Quad-Core Processor - Processors - Desktops
AMD LE-1640 - 2.6ghz single core AM2 processor - $27 shipped
Gigabyte GA-M61SME-S2 mATX motherboard - $18 shipped. The pci-express x16 slot does not work, so I have been using the onboard video which works completely fine.
I prefer selling this together and I will do it for $35 shipped. I will ship it with the processor in the motherboard. I have the original packaging for both of these also.
Ask any questions you may have, and if you need pictures let me know. I have plenty of feedback on here also, and you can check the feedback forum.