Don't worry I help your luck a bit, Turnigy has new stock of SK3s 245Kv!
EU warehouse http://www.hobbyking.com/hobbyking/store/__39965__Turnigy_Aerodrive_SK3_6364_245kv_Brushless_Outrunner_Motor_EU_Warehouse_.html
USA West warehouse http://www.hobbyking.com/hobbyking/store/__35029__Turnigy_Aerodrive_SK3_6364_245kv_Brushless_Outrunner_Motor_US_Warehouse_.html
AU warehouse http://www.hobbyking.com/hobbyking/store/__32077__Turnigy_Aerodrive_SK3_6364_245kv_Brushless_Outrunner_Motor_AU_Warehouse_.html
International warehouse http://www.hobbyking.com/hobbyking/store/__18128__Turnigy_Aerodrive_SK3_6364_245kv_Brushless_Outrunner_Motor.html
In case you want cheaper motor but you'll need to rewind it, http://www.hobbyking.com/hobbyking/store/__23521__NTM_Prop_Drive_50_60_Series_380KV_2665W.html
You already know the factory which makes motors for me, it is E-Max so you can try to contact one of their representatives. But don't hope too much, I could negociate custom kv motors because we made agreements, they need guarantees that it is economically viable (they can't throw money out of the window). Though in case my actual 85Kv would not be enough, I can negociate even lower Kv but sampling cost is also huge. Plus it is my first motor from them, the layout I asked for respect 98% of their standard layout, the remaining 2 percent being 1-shaft 2-lowered kv.
I might dare and negociate full custom model after my first order at least is honored. Now this might become a monster of hybrid tiny can, got crazy layout idea in my mind but right now I stay focused on my e-treks.
EDIT : About SK3 motors you can take off the flange as it is a huge heatfan. It shortens the motor a lot, not perfect but for cheap and reliable prototyping you can start there and it won't take long to be done :wink:
BTW need to update, FINALLY received power cables for my 3D printer!