You can buy a manual 35mm film rangefinder camera, like my Canon Canonet QL17 G-III for around $100 on eBay. There’s even a Canonet G-III QL17 flickr group.
Canonet QL17 G-III
Zorki Rangefinder Converted to Digital
Someone stuck a Sony DSC-WX1 10.2 MP digital camera inside a Russian Zorki rangefinder (a Leica II copy) – a melding of a 1950’s classic film camera with a modern digital camera.
The original site is in Japanese. (English Google translation) There are detailed build photos; the body was re-covered and even the rangefinder’s shutter release works the digital camera’s shutter. It is a beautiful hack. I wish I had the patience to do something like this.