Newegg has the Western Digital VelociRaptor 300GB 10000 RPM 32MB Cache SATA Hard Drive (WD3000HLHX) for $70
with free shipping. This drive boasts sustained data transfer rates of 145MB/s and a MTBF of 1.4 million hours. Comes with a 5 year limited warranty. SSDs this size typically go for around $170.