Hi Ralph,
Well I was thinking more on the Microtek M1 or the Epson 750 - around the $600-700 range. Though a $100 scanner is interesting now that I've found a scanning rental place in NYC. Like any digital technology, scanning technology I think increases every year, so a $2000 scanner a couple years ago would have the same quality as a $500 scanner today - don't know for sure, just a hunch I have.
I can't even begin to rationalize pricing.
What is lacking, is extensive up-to-date scanner reviews like one would see of digital cameras on sites like DP Review. So far the only reviews I have seen are of older version scanners and people posting on forums their anecdotal evidence, many with suspect testing methodologies.
I use an Epson 4990 that I bought for $400 I think some 5-6 years ago. This csanner has given me decent enough scans for inkjet negs and chromogenic pints from a Lambda or Lightjet. But, I don't print anything larger than 10x10. Maybe if I needed to print larger, I would re-evaluate.
Anyway, my post is just farting out some thoughts.
Regards, Art.