Try this site for information: https://powerequipment.honda.com/lawn-mowers/compare?modelid=hrx2173vka&modelId=hrx2174vla&modelId=hrx217k5vya&modelId=hrx2173hya
My local dealer in Bethlehem PA stated end of July the earliest; however it could also be next year.
I did find an elusive HZA model from Mowers Direct available. I know these were also unavailable all year from every dealer I contacted online and in NJ/PA. Do not know where these came from...