I bought my N90s from KEH about a year ago for $29, BGN rated. For the life of me, I cannot find a thing wrong with it. Not a scratch or blemish. Everything works like new. I've said before, my take would be that this was a camera shop display model, and I mean a real camera shop, not Best Buy where people abuse the displays. The only "fault" I could mention was that it came without a body cap.
I would not hesitate to buy another one of these $29 dollar bodies - still available.