I bought this CatEye Enduro 2 computer on Craigslist a few weeks ago for $15. It was unopened when I bought it. I tried to install it today and discovered my front shocks are too tapered to hold the sensor in place.
So, my loss is your gain, it is still basically brand new, opened for 45 minutes to attempt the installation. Includes all brackets, manuals etc.
It has pretty good reviews : http://www.mtbr.com/cat/accessories/computer/cateye/enduro-2/PRD_350872_114crx.aspx