Some local demos here (possibly from the Performance Center):
https://www.hennessyporsche.com/used...18-boxster.htm
Edit: All PDKs, alas.
Oops. The 4 cylinder. Obviously haven't been following closely. But, we do get more than our fair share of Performance Center demos, so probably next year will see some lightly used (ie: abused by PCA drivers and paying visitors) 6 cylinders for sale.