Yeah, $150 seems steep.
I got my new windshield a couple of weeks ago, it was $225 -installed!
I watched the guy Roloc the body flange, prime it, dry it with a heat gun (it was cold and rainy) goop the opening with a high bead of poly and install it.
I gave the tech a $25 tip because my seat of the pants expected $250, so that's what I had budgeted.
A rear window is much easier than that.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.