I agree. Land cost excluded, we built in 2013-2014 and spent about $180/sf and I would consider our home to be middle of the line in terms of cost per square foot. I estimate if we built our same house in 2017-2018, it would probably cost at least $200/sf.Even with land cost excluded, I don't think you can build a home "along 30-a" for anywhere close to $100/sf. I fully agree with all the other info provided.
Shop around and ask lots of questions.