At my dealer, the drawer where they keep the hose (called "Fresh Air Duct", if I remember right) is right in front of the parts counter window, and the last time I was there when one of the guys pulled open the drawer, I saw that they had four or five.

Anyway, the Volvo p/n is 1367454-4, and the list price was $33.95 (not cheap, but you wrote that you were tired of cheap parts).

Be sure to get a strong clamp to seal it against the throttle body throat -- I had a whole adventure (reported last month on this forum) about failing emissions and a lousy idle, and one of the main reasons is that there was a subtle leak around where this duct (although brand new, and a Volvo part) goes into the throttle body. I thought I had a really tight clamp around it, but a mechanic put a smoke machine into the intake, and a cloud of smoke came up (looked like the BP oil leak) -- he fixed it by putting some black goo around the mouth of the TB and then putting the duct back on, and (with a little more fiddling) the idle and emissions were good.
Apparently, the old throttle body (although I had cleaned it) had enough roughness on its surface that the duct couldn't really seal against the bare metal throat.