nightsurge on 15 December 2008
This isn't a special deal, so I'm sorry if I got some of your hopes up. 
However, seeing as how I am giving a step-by-step of how I did this, perhaps you can use this as a tutorial for saving yourself lots of money!
Here is what I did:
- Found a great deal on the hard drive with data transfer kit for $120 online.
- Copied over my data once I got it.
- Sold my old 20GB hdd
- Sold the data transfer kit
So, after selling both of those on eBay, I managed to net $80. Subtract that from my $120 cost to upgrade and it came down to being just $40! I have installed Fable 2, Gears of War 2, and the first 2 discs of Lost Odyssey and I still have a good 80GB left! If you decide to go this route, you may not be able to get quite $80 for the both, but I would say $50-60 is probably very common and a good investment as that would mean a 120GB hard drive for just $60-70.
