well i got my E8400 new for $174.99 however now its $169.99. a Q6600 is $194.99 new. That's a difference of $20 and i figured i'd take care of shipping. Now, i am figuring the Q6600 will be used, so all in all it comes out to..
$20 + Shipping (for me and the trader.) + an E8400 w/ Box, Manual and HSF to the trader and a Q6600 back to me.