I tried this junk yard search engine and it seems to good to be true:
http://www.partshotlines.com/component/phl/search/share/zip:85749/year:1989/make:CHEVROLET/model:89/parts:{"412":["161B"]}
NP241 from the east cost around $150 shipped. A bunch of them. I wonder if I'm missing something. It would cost me $75 in gas to drive up to Phoenix for one...