several people have deals running on them. if you are looking for a new one, I think this is the best deal I have found but you might want to look around (notice the free shipping)
http://shop.microimageonline.com/ScanGauge-II-SGII.htm
there are also people that really like the ultragauge and it was about $77 shipped so it is a cost effective alternative.
http://ultra-gauge.com/ultragauge/index.htm
I have both, scangauge in my cavaler and ultragauge in my yaris. good luck with your choice. both are well worth their money.