And you specifically have to request it. It isn’t a normal option during purchase.

Nah, with how ticketing is these days they'll bug you a dozen times to choose between the $50 basic economy disaster package that only has the mask and 50% airflow or the full package for $100 that includes another 25% airflow and a flotation device. Business execute gets you the parachute, a private life raft, and a few days of MREs for $250.