250 is a little steep...check out Advance AutoParts...you can order it online or over phone for only $129.00.
Here is the link:

http://www.partsamerica.com/PartDetails.asp?SourceArea=&SourcePage=SEARCHRESULTS&MfrCode=EQU&MfrPartNumber=3100&CategoryCode=3389

Also, on eBay these 3100's are going from between $60-$110(used to new condition).

I saw an AutoXray 5000 for $400.00, but Im not sure if Im quite ready for that type of diagnosing power yet...

__________________
1994 S320
131K miles

1998 ML 320
126K miles

1994 Blue C220
122K miles

Im going to Grad School @ the University of Iowa
Go Hawkeyes!!!