Newegg has the Western Digital RE4 WD1003FBYX 1TB 64MB Cache SATA 3.0Gb/s 3.5" Hard Drive (Bare Drive) for $120 - $20 off with coupon code EMCJJNB39 [Exp 11/14] = $100 with free shipping. Features a 64MB cache, 1.2 million hours MTBF, TLER and RAFF technologies, and a 5 year warranty.
only $7 more through amazon.com and that $7 gets you much, much better packaging so the drive won't arrive damaged or DOA.
http://www.amazon.com/Western-Digital-Cache-Enterprise-Drive/dp/B003SANWI6