Don't you have any local shops that wheel and deal a little used stuff?
The 4400 Echo is a good saw. If I took a good one of those on trade, I'd allow about $125 or $150, and get $150 or $175 for it within a week. Echos in good shape are very resellable.
However, I realize that many of the bigger shops don't trade, liability fear I think. Liability don't scare me, they sue this old squirrel, they will have to find where the nuts are buried. I own a little but don't really own nuttin, if you know what I mean.