There may be a smaller ENGINE but it was never a production ENGINE. The TD010 still holds that distinction. Actually Cox prices weren't the lowest. Wen Mac's were cheaper but hen they were lousy engines. Cox babe Bee 049 was $3.95 and the TD 049 was $6.95. his was when a McCoy redhead 35 by Testors was $5.95. The TD010 was $8.98. That was big bucks to a guy that made 20 bucks a month delivering the Seattle Times.