I have all kinds of bows lying around on my ranger so here's a list if anyone is interested. I don't have much idea nowadays how much they are worth but I tried to keep it fair, of course if you see me in-game they might be up for a little debate.
Urgoz's Longbow 25k
Ironwing flatbow 3k
Deatheater longbow 2k
Ryver's Shortbow 2k
Thornbeard's horned bow 2k
Zelnehlun's longbow 2k
Koahm's flatbow 2k
and a bow grip of fortitude (+30) goes for 4k.
EDIT:
[all gone, thanks to buyers.]
Selling green bows (incl. Urgoz's Longbow)
Traveller