This is the first digital range finder with a Leica-m mount. It was released back in 2004 but still cost a pretty penny on the used market. I decided to review it after my viewers decided I should via one of my polls on youtube.
Epson R-D1 Review
The camera needs to be bought on for example eBay but the lens I used is available in stores:
7artisans 35mm f2
Epson R-D1 Samples
You might also want to checkout the Leica M8.