Fox Engines
Order it from the factory, BUT, call ahead and get the price, tell them you have an engine to trade in on it and it will be half suggested retail price. you can send them in an old beat up Cox .049 engine and they will sell you the Fox 61 for half price.
Half Price. I just go to the factory and buy engines there for the same deal, but its only a day trip for me.
Call em if you don't believe me, but it's true. Control line folks who run Fox 35's and the like know this.