The Night Axe are willing to offer their finely crafted useful objects to adventurers in exchange for more resources (hide, bone, obsidian, etc.)
Every time the PCs bring at least 100gp worth of resources to the Night Axe, roll on the Night Axe Treasures table (HSI pp. 160, 166-167.) It'll take the Night Axe 1d10 days to complete the crafting process. Subtract 1 day from the process for each additional 100gp worth of resources the PCs bring, minimum 1 day.
The below table offers some stats geared toward the GLOG system, but can be easily converted for any other retroclone.