Barracuda STBD2000101 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Hard Drive (Rebate Required) for $79.99 + free shipping
This is Newegg's "Shell Shocker", so get it while it's hot. There is a rebate, though, but even before rebate ($89.99) it isn't too bad of a deal per gigabyte (I think). Rebate price per gigabyte is $0.08 (rounded), without rebate it is $0.09 (rounded). 2 year limited warranty, etc.
Newegg rebates are usually pretty easy too. I've never had trouble. And if you have a Shoprunner account, this has free two day shipping.