There are several other sprocket companies out there, guys.
JT is the one that I have used in the past and the one I am most familiar with.
You can also look up:
AFAM
Sprocket Specialist
Suntour (they may only be for bicycles, I can't remember)
Sunstar
Vortex
There are others, but I can't think of them off the top of my head. If the JT sprocket is backordered, you can just order one through another company.
Some other websites to help you are:
www.MAWonline.com
www.ronayers.com
www.parts411.com
www.denniskirk.com