Best Buy
I picked up the i7-3770 cpu with 16GB of ram and used it to upgrade an 1155 socket motherboard that had an i5 cpu in it with 16GB ram. Now I've got 32GB ram (the board has four slots) and the i7.
The best thing about this purchase is the cost. I bought the whole kit (i7 and ram) for around the price of the cpu by itself which means I got a 16GB ram upgrade for free!
The purchase went smoothly, I got a tracking number, the item was package well in a non-static bag and lots of bubble wrap.
I saved a lot of money by buying used parts. In the past I've spent thousands of dollars buying new only to see the value reduce to zero over time; buying computer components has been an expensive hobby. The i5 I upgraded from was an upgrade from a core2 quad. The i5 was also a used cpu from Ebay, and since then I've sold the i5 for about 70% of what I'd paid for it twelve months earlier.
If anyone is looking for a cheaper way to keep their computer relative fast, do your homework, work out what parts you need, and take a look on Ebay.
Good hunting!
Verified purchase: YesCondition: Pre-owned