I have got a 3-d foamy and had to get some micro servos as well. i didnt want to pay for hs-55 so i went to lightflightrc.com and got an awsome deal and $5 shipping. I got the purple 9g, 21oz inch torque servos for $13.95.

they also have:

4.3g, 5.55oz/in for $14.50

6g, 12oz/in for $14.50

13.4g, 35oz/in for $14.50

15.6g, 50oz/in with metal gears for $19.95

They also have brushless motors, esc's, receivers, and lots more.

Hope this helps!