I thought HobbyKing had a "warehouse" in USA -isthe T600motor not available directly from there ...?
There are some other choices:
1. Thereare some new OS heli motors coming out:
O.S. OMH-4535-560KV Brushless Outrunner 600-650 Heli -looks like will be ~$130
https://rcjapan.net/o-s-engine-o-s-e...khlv3rta7afeg0
http://www3.towerhobbies.com/cgi-bin...?&I=LXDDGR&P=7
2. E-flite 600 Heli Brushless Outrunner Motor (1130kV) $119
http://www.amainhobbies.com/product_...r-Motor-1130kV
3. Scorpion HKIII-4025 series $219 -for 600 Heli
http://www.scorpionsystem.com/catalo...40/hkiii-4025/
There seems to be no Turnigy SK3 motor for a 600 heli -
http://www.hobbyking.com/hobbyking/s...tors-Heli.html
That is just from a very quick look; No doubt there are many more ...