I think they are going between 13-18k from the few ive seen sold over the past year or so. They are OK, quite controllable considering the cartridge fired. However, they can be pretty temperamental when it comes to ammo and gas issues. Typical crude soviet production and good luck finding parts in any quantity. If youre trying to get into a rifle cartridge in this price range theres better choices in my opinion, such as 1919, m2 side plates, various ww1 beltfeds, vickers, etc, FNC though lacking in the parts department, and m14's come to mind.
video on the avt 40