the lowest priced 2.4 gass motor I have seen is the US Engines 41cc. $270, is a good motor for the money, but some heaver than others,,,
if you Email me I know where you can buy a ""NEW"" never started, still in the box Zenoah G38 for $250 plus shipping, this G38 is a left-over motor from my friend's Hobby shop that closed.
http://www.us-engines.com/
Jim
my E__
[email protected]