As I've just upgraded the hard drive in my empeg, I now have 2 used IBM Travelstar 20GB drives available. One is model# DARA-21800, the other is model# DJSA-220. Don't let the 18000 model# fool you, they're almost exactly the same size:

IBM-DARA-218000, 17301MB w/418kB Cache, CHS=35152/16/63
IBM-DJSA-220, 17297MB w/1874kB Cache, CHS=37488/15/63

Both drives are in perfect working condition. The DARA-21800 is the original drive that came in my Mk2 and just celebrated its 3rd birthday, the DJSA-220 is a second drive I bought later and have been using for about 1.5 years. Because of these differences, I'll price the DARA at $45 or best offer, and the DJSA at $60 or best offer. Buyer pays the shipping costs, I'll ship anywhere. Payments via Paypal *cash* payments (preferred) or check/money order.