Take a look at these guys. They sell both Futaba and Hitec servos. Browse through the chart and find a Hitec servo that has similar specs. It might be cheaper...

Hitec Servo Chart:

http://www.servocity.com/html/hitec_servos.html

Futaba Servo Chart:

http://www.servocity.com/html/futaba_servos.html

But spending money on good servos is worth it. They're almost like an heirloom... the cars change, but the servos just keep getting handed down to the next car...