I recently bought and had Cruise Control installed on my PT Cruiser. The parts were about $200, if I remember correctly, and the dealership charged $150 to install. With the dealer coupons accrued from credit card points, I ended up paying $18 to install. The parts were the real Mopar equipment, not aftermarket.
Time to install was less than eight hours and all the parts come in a small box. LOTS of tubes, wires and replacement parts for the steering wheel to allow the buttons or levers (depending on your configuration) to be mounted.