Full Price you say. The 40 size sold in my local hobby shop $54.00. I still have the box with the price sticker attached. For the money, dare I say the FP seris of engines were the best engine OS ever made. I also have one that is on a Tiger 2 and that plane was built in the mid 90 and the OS 40 FP on it still purrs like a kitten. This is also the first RC plane that I have owned in over 30 years of flying that I have worn out a set of wheels on it. The LA engines are nice, but I will take an FP any day. Good Luck, Dave