I use this item:

http://www.aluratek.com/product_info.php?products_id=66&display=All

It was only like $50, and then you can plug in any 3.5" or 2.5" internal hard drive you want.

LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7