I assume that's $100 including the lenses—seems like a reasonable price for something that requires custom high-precision manufacturing, although it would be great for the price to come down even further over time.
I have a moderately strong prescription (with slight differences for each eye) and I got the best glasses I've ever had from Zenni for $72.90 + tax. Could have been $60 without a presumably overpriced anti-reflective coating. I don't remember how much my glasses cost from traditional sources, but I think it was on the order of $200–$300 after insurance.