I realize it's not a DSLR but one of Canon's early attempts at a mirror-less camera was the Canon Pro1. The Pro 1 even came with a built in L lens.
At one time it was around $800.00, squarely in the mid price point for DSLR's today.
However is was very slow, had a hard time focusing, the shutter lag was/is nerve rackingly slow. Sure cameras have come a long way since 2004 but in many ways this was a great first attempt.
Here are the details from a review site. http://www.shuttertalk.com/articles/canonpro1