Ever since US Airways management took over at American, AAdvantage sells miles the way that US Airways used to. Regular price only seems to exist to promote discounts against. Miles are usually sold with a bonus, a discount, or both — not regular price.
Frequently they sell miles at around 1.88 cents apiece. Once in awhile they get that down to 1.77. Only twice before that I’ve seen have they sold miles at 1.72 cents each. First in June 2016, then again in 2017, and now the offer is back. It ran in June, now it’s extended through August 1.