Saitek Pro Flight Rudder Pedals
The Saitek pedals are in a similar price range as the CH Pro Pedals.
(the shoe in the picturer gives you a hint about the size)
The pedals center themselves, but the spring loading is not very strong. The large knob in the middle can be used dampen the movement. In the maximum setting it feels as if one had to move a lot of machinery.
The pedals work flawlessly under Linux. They have three axes: one for the use as rudders, and one for each pedal - you can push them down like an acccelerator or a brake. The sensitivity is not too high.