Try Autogyro Company of Arizona . They have a couple to choose from, one based on a sig Rascal. None are cheap however. I built the big Kellet kit, but for learning an Autogyro I bought a PT-Gyro from Flying Balsa. com. Nice kit, easy to fly. Here's some links:

Autogryo Company of Arizona - http://www.autogyro-rc.com/default.asp

Flying Balsa - http://www.flyingbalsa.com/

There's also an Autogyro section here on RCU, Under Helicopters.

Steve