gunsamerica or gunbroker are good resources ....but like selling any gun / condition in the eyes of the buyer is everything ...
The Auto 5's have their audience ....but its yesterday's technology ....and
$ 350 - $ 500 is probably the average price for a gun in very good condition around here. A photo would help us tighten that up for you a little maybe ...
I find the Auto 5's, in terms of popularity and price, vary a lot by region of the country as well / and speaking only for my area ....there seem to be a lot of them on the shelves around here at the used gun stores. So they just are not that popular up here ...