Hey Nitro Nut, Brooklyn Hobbies, has it for 169.99. Click on the link below, then click on engines, find the RB logo, click on it, and the 3rd engine down (X12 SG Shaft w/Slide Carb) is the Engine you want.
http://www.brooklynhobbies.com/shop.htm
sorry for all the edits, hopefully you got the right link. I had to change it a few times cause a few werent working right. Anyways, hope that helps.