I got the trinity for $30 at my local Hobby Town USA. It's also listed on this site: http://www.hobbypeople.net/gallery/844231.asp

I gave my heli a whirl last night with the new engine and she had lots of spunk. Mind you I haven't learned how to fly yet - so getting it in my head to use the tail rotor is very hard (I never used the rudder control on all my RC planes).