I found an Echo cs-3900 at a yard sale this morning for $5 and figured i couldn't go wrong, but not so sure now. Someone had put pure 2 stoke oil in the gas tank and the choke pull is broken off. HLS does not even list it for parts, but ereplacementparts has the choke rod for $12 plus shipping, so probably $20. Then a carb kit from ebay for $10-$15. And it is a 30 cc saw, though it feels solid and it has spark. Anyone know anything about this saw?