This is what I have been using for the last couple of years and I love it.
It doesn't fit your inexpensive criteria, I paid about $500 with the extra locking kit.
It's also kind of cool in that there are other things that you can buy to carry golf bags, luggage, skis or snowboards.
I love the ease of putting the rack on the car. It only takes a couple of minutes once you get the preliminary installation done.
Nissan 370Z** Coupe Bike Rack® wi
Installed on my car.