They're available. Though you probably shouldn't invest to heavily in gen1 (production) sodium-ion batteries. It's looking like they'll be obsolete pretty quick.

https://battery-tech.net/battery-markets-news/gotion-unveils...

> something I can really buy

What are you going to use them for?

Consumer batteries are already good enough IMO. Cheaper batteries in large quantities are what we need more of.

My point is that this is clearly out of the lab.