You can pick up a Hitec HS-75BB retract servo from Servocity.com for about $29.00. That's not at all out of line.
The JR/Hitec/Aitronics Z connector are all fully compatible with the Futaba connector.
Read up on retract servos in the Comments section at:
http://www2.towerhobbies.com/cgi-bin...?&I=LH4299&P=1
John