Have convinced the hubby that I need a Scangauge on my new Smart.

I've searched this forum and found so many posts I gave up finding a quick answer and just decided to ask in my own thread. So, where's the best place to buy one? Does someone on this site sell them? They're about $170 on the scangauge.com site, but I'm hoping that we Smarties can get a better deal.
And many thanks to those who've posted step-by-step installation instructions. Those will come in REALLY handy.