OEM, but still one heck of a price:
http://www.newegg.com/app/viewproduct.asp?DEPA=&submit=Go&description=8mb+72 00+wd+180gb
7200rpm, 8MB cache, 3-year mfg warranty
You can get it for $179 shipped here:
http://www.esystor.com/shop/IPS003.asp?ProCd=WD1800JB&LClssCd=080&LClssNm=Hard %20Drive&MClssCd=010&MClssNm=EIDE/IDE
And they even have a good rating (8.85) at www.resellerratings.com.