Less expensive motors?

Two posts ago, I had found a servo that exceeded the torque I need. However, it costs $31. I'll need two (one for each shower knob), which will bring the price too high for a novelty-buy. So I've been looking for alternatives. My first thought was gears, which can increase the torque to essentially any amount. Adding gears and buying a cheaper motor should drop the price significantly, I thought.

Annoyingly, gears are really expensive! I found one for $3.60, but in order to increase the torque, the cheapest complimentary gear I could find was like $14! So almost $18 worth of gears, and I still need a motor. And I don't actually know how to set gears in place. While I may still be able to get help from people who know how to use gears, I think I've found an alternate solution: a cheapy gearmotor!

These gearmotors cost about $6 each, and can be retrofitted with a $2 motor to double the torque, which would bring it to about 100 oz-in, which is what I need! Look here for more info. Ok, gots to go to work :(