I went to Harbor Freight last month and bought this for $79.99...

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=94217
http://www.harborfreight.com/cpi/photos/94200-94299/94217.gif

It has worked well for me--I've already used it on several cars with good results. And, the price is right... And yes, it reads CAN protocol. I wouldn't buy one without that option...

-GH

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For Now:
1992 Mercedes Benz 500SL
1998 BMW 528i
2003 Honda Element
2002 CBR600F4i
1977 Coachmen Motor Home