That is disappointing news about The Auto Bolt products---I emailed Greg a few weeks ago after reading they had introduced a newer version than ones I'd bought back in 2008. I did quickly receive a reply so not sure what's happened since.
The Auto Bolt is a unique design and to my knowledge there's no one else offering anything similar. I did install deadbolt locks but of a very different design, try this site: https://www.a1electric.com/catalog/cat_dead.htm
. They accomplish the same protection and if they're more readily available might be one of a few choices.
Those locks are probably a bit more challenging to install for most people but its not an insurmountable process. I've done it three times now and each time gets relatively "easier" I guess. The only really important thing is aligning the lock bolt with the receiver point in the opposing door.
Should you go that route I could better detail the installation perhaps.