Yamaha DTXpress/DTXplorer/DTXtreme

All:
This is probably a stupid question, but do any of you know another 
place to purchace a used dtxpress I or II besides your typical web 
auction site?  I want to buy another rig but the only outlet I come 
up with is Ebay.  Are the early I or IIs fairly obsolete right now?  
Another thing is price, I really don't want to spend much over five 
or six bills at the moment.  I bought my first dtxpress I from a co-
worker.  Man that was easy.  Got to try before I buy sort to speak.  
Anyway, thought I'd throw it out there.  Thanks.  Shuman.