I always liked crossbows in games, so I was very excited when I saw a crossbow weapon in the gameplay trailers, yet I fail to find it in the game. Usually all the weapons are listed in the weapon list with the requirements you must face to unlock them, yet this one does not (neither does Hurk's Harpoon gun).
So, I've been in the first Arena mission earlier this day (started by going to your old house), and one of the missions around the camp you end up after that one (called Shanath or something like this) is a Hunting: Control kind of mission.
When you take it, the man tells you that there should be his brothers Crossbow near the mission location. When I get there, there are just a pile of ammo and no crossbow.
So, where do you get a crossbow?