Looking for a ~300 degree/sec gyro
Check Invensense. They have a nice range of gyroscopes and seem to sell directly from their site. Don't know about export restrictions though.

If it is only for a single project or a prototype, you can always try to gut a Wii motionplus for its part: the invensense IDG-600. Cheap motionplus modules can be found on dealextreme. This one for instance, appears to have an Invensense IDG-650 which has a selectable range of 440 deg/s.