I'm one of the few people that goes shopping at the dump. Last summer, I amassed a sizable collection of reclaimed lumber by scrounging through the demolition pile at our local landfill. Most of what I usually find are shorter length boards perfect for a project like this one, so I was able to frame almost the entire staircase using somebody else's trash.
I needed to terminate my stud wall before reaching the top, as it was encroaching on the yellow brick road below. So I cut stringers to support the final two steps. This also allowed enough headroom to frame in a standard sized door so we can use the area underneath the steps for a storage closet. I had enough cutoffs from my previous drywalling projects to skin the whole stud wall without having to buy any new material. Here is a sneak peek at the roughed-in stairs. Eventually I will install thick pine slabs for the treads and build a nice curving handrail and skirting, but for now it is usable- no more ladder climbing to get to the second story!