Here are the more reasonably priced items I have found. It's very easy to spend 10 grand for a nice, cutting edge velomobile. If you find lower priced equivalents, please share it.
Terratrike Rover $699 I would purchase the 1 spd and add a derailleur, shifter and cogset I already have in my garage. The Rover seat bottom is an inch higher than the other models, which would benefit me at dangerous intersections.
Blue Sky Designs HPV body $400 plus shipping. No floor pan. I don't want the glass canopy as it would certainly fog up in my climate;
This guy will provide the trike, body & build it for you for $3399 plus shipping
Here is the Flevo Roof $350. No fogging.