Servos are a universal part of the RC world. Planes, helicopters, cars, and boats all use servos to control certain things. However, the smaller electronics get, the more they cost - usually.
Basic micro servos cost $15 (HS-55), and higher performance ones can run up to $30! I wasn't ready to dish out even $15 for a micro servo, so after a little researching, I came across Hobby City (United Hobbies). They are a large warehouse overseas, and they sell discount RC items to people around the world. They have unbelievable prices because they buy their products direct from the factory. There, I found the servo perfect for me - the Hextronik 9 gram micro servo for only $3.65.
The specs are as follows:
Size : 21x12x22 mm / 0.74x0.42x0.78 in
Voltage : 3v ~ 6v
Weight: 9g / 0.32oz
Speed : 0.12 sec/60(4.8V)
Torque : 1.6 kg-cm
Working Temp : -30C~60C
Teflon Bushing, 15cm wire, coreless motor
I opted to order 3 of these servos for use in a RC project I am working on. Since Hobby City is located overseas, the order took 3 weeks from pressing the buy button to my doorstep. That is about the average amount of time for a order from the other side of the world. The physical shipping itself only takes about a week, but the processing and packaging is what takes the other two weeks.
After a lot of waiting, my package finally came. The servos came in little plastic bags, along with a smaller bag with the proper servo mounting screws and extra servo horns. The parts were almost exactly like HS-55 servos I had bought for $15, but these were under $4! I mounted a servo horn, and found that the fit was very good, as compared to some other cheap servos I've tried at Hobby City. When powered up, the servo performed well, my only concern being that it was quite noisy. Overall I'm very satisfied with the Hextronik 9 gram servo, I'm sure I will buy more of them.