As of 2019, no Autocad release is listed for purchase on the MacOS App Store. The latest version available for Mac is AutoCAD 2019 as of December 2018. AutoCAD 2014 for Mac was available for purchase from Autodesk's Web site for $4,195 and AutoCAD LT 2014 for Mac for $1,200, or from an Autodesk Authorized Reseller.
The full-featured version of AutoCAD 2013 for Mac, however, wasn't available through the Mac App Store due to the price limit of $999 set by Apple. AutoCAD LT 2013 was available through the Mac App Store for $899.99.