This is a recent price drop.
Western Digital Caviar SE16 WD6400AAKS 640GB $80 + FS Newegg
http://www.newegg.com/Product/Product.aspx?&Item=N82E16822136218
3 year warranty
Now, this may be already posted by I am posting this for comparison here. You get 5 year warranty if you pay 5 bucks more.
Seagate ST3640323AS 640GB 7200 RPM 32MB Cache SATA 3.0Gb/s Hard Drive - OEM $85 FS Newegg
http://www.newegg.com/Product/Product.aspx?Item=N82E16822148335
5 year warranty
Thanks to Ocean935 for pointing a 750 GB Seagate (with a 2 GB SD card) for $95.
http://www.newegg.com/Product/Product.aspx?Item=N82E16822148134&CMP=AFC-C8Junction
5 year warranty
Excellent deal on Cavalry 1TB EXTERNAL : http://www.fatwallet.com/forums/hot-deals/866126
