This may have been mentioned already but Micro Center has a has Intel Q8300 CPUs on sale for $89. A further bonus is these CPUs are the the VT variant. These are going for $149 on Newegg. They are also a very good overclocker. I installed one in a Gigabyte GA-EP45T-UD3LR motherboard and have it running stable at 3.8ghz. It is a nice cheap upgrade for those with S775 mid range single/dual cores that want to get a little more longevity from their rig.
BTW, this deal isn't available online. You have to get one at a MC store.