The airtonics 737 is probably one of the best servos you'll get for under $60 and its just under 60. I've run one in my sedan and it has good torque(57oz) and is relatively fast(.15sec). It's also high quality servo. Stomer has them for just under 60:
https://www.ssl-stormerhobbies.com/c...?pn=AIRS94737Z