Just upgraded my system and I have the motherboard, cpu, and ram available. Free but you will have to pay all shipping charges or pickup from the Seattle/Tacoma area.

EVGA NFORCE 680I SLI MB REV D
D- CORE 2 QUAD 2.40GHZ Q6600 8M 1066MHZ STEP G
8GB RAM, 4x 2GB.DD2.DIMM.I

It was usable for 5-boxing with a (not included) GTX 465 graphics card, but it would lag quite a bit with all 5 toons in a busy town such as Stormwind.