@tweber7 your original should have been a WD Scorpio WD3200BPVT which is a
Form Factor 2.5"
Interface SATA 3.0Gb/s
Capacity 320GB
Cache 8MB
Average Latency 5.5ms
RPM 5400 RPM
You can replace it with any drive that uses the same interface. As to where to buy it, there are lots of places and you want to pick one that you like. Anything we suggest is most likely from personal preference like [http://www.newegg.com|for me.]