go to towerhobbies.com, horizonhobby.com, servocity.com and hobbypeople.com and do a search on gyro. You will find a wide range of gyros. However, if you want to know specific constants for a gyro that mean something in a dynamic control analysis, you may have to buy one and test it yourself.

There are also some cool autopilot devices available from fmadirect.com that use horizon sensors to right an airplane. That could be used as stabilization as well.