Diagnostics device?

Anybody know where I can get a OBD II (on-board-diagnostics) device?They are for cars sold in the US after 1996. Someone from another site recommended it to me so that you know what repair needs to be made, or if the mechanics just turned of the check engine light without repairing the problem.

Search Google for "OBD II"

http://www.ghg.net/dharrison/obdscan.html
http://www.auterraweb.com/scantools.html
http://shop.store.yahoo.com/rodi/eqobdiicodre.html
etc.
See also:
http://www.obdii.com/scantool_selection.html