Hmm - here are some (smaller in certain dimensions) possibilities:
http://www.hobbypartz.com/9gmiseexis1.html
http://www.rctoys.com/rc-toys-and-parts/BA-36G/RC-PARTS-BLUE-ARROW-SERVOS.html?utm_source=googlebase_froogle&utm_medium=US&utm_term=BA-36G
http://www.virtualvillage.com/set-of-4-3-7g-micro-servos-003603-005.html?utm_source=googlebase&utm_medium=shcomp
http://www.amazon.com/Draganfly-Gram-Sub-Micro-Servo/dp/B000QV4LXU
Hmm - but none of these are really smaller than what you have found, I don't think.
These guys may have something small - but not likely anything that would work for your application (and they likely aren't cheap, either):
Hmm - how about this one:
http://www.pz-servos.com/en/products.asp?id=2&menu=ShowDetail&P_Id=801
Found this via this thread:
