Noticed this bike carrier seems like a decent price.
Blurb from web site:
Top Features of the Twinny Load Traditional Tow Ball 2 Bike Rack
Our entry level Twinny Load rack. Comes complete with the same bicycle clamping system as it's more expensive stablemates, which holds your cycles by the pedal crank and the wheels, allowing many 'non-conventional framed' bikes to be safely mounted to the rack. This mounting system allows for both straight and angled 'low-profile' cranks to be held, making this a truly universal bicycle fitting system. Will fit both Swan-Neck and bolted style tow balls.
Travelling by car with your bike is much easier if you can carry it on the outside. It doesn't take up any room inside the vehicle and you don't get mud and grease all over your upholstery. The simplest racks to use fit onto the rear of the car. Most grip the vehicle with plastic-coated hooks which must be positioned where they can spread the load. With all these racks, it's vital that the rack is firmly attached to the car and it's best if you then fix the bikes to the car itself, not just to the rack. If you have a tow-ball, use it! That way, the rack won't even touch the car and the whole setup is really secure. If your car has roof rails, you can mount cycle carriers to them. This works well but be careful when entering car parks with height barriers! Whichever type you choose, make sure you lock the bikes to the car if you want to keep them.
About the Twinny Load brand
Twinny Load manufactures a wide range of quality cycle carriers. High quality, heavy duty construction, Twinny Load lets you discover the world, wherever you go. With Twinny Load your bicycle is always there, when you need it. Freedom ... and convenience.