Seagate Barracuda 7200.8 - hard drive - 300 GB - ATA-100 Internal Upgrade Kit $109.99

Seagate Barracuda 7200.8 drives provide high-performance, highly-reliable storage for PCs and advanced applications, backed up by an industry-leading five-year warranty. Their best-in-class combination of capacity, performance, and support ideally suit them for such applications as high-performance PCs, media PCs, ATA-based servers and RAIDs, and cost-effective network attached storage (NAS).

Buy.com is carrying this 300 GB Internal Hard Drive for $109.99