If you visit the B&H retail store in NYC they sell all kinds of stuff for basically everything that is more "pro" level which is beyond what you can achieve with a regular smartphone with its built in lenses. Particularly for video production. Highly worth the visit if you're ever in NYC and have never been to it.

Lighting, audio stuff, equipment cases, backpacks, tripods, battery packs, that sort of thing. It's also stuff in the category of "Accessories" that have much profit margin built into them, much like how a Trek or Specialized branded road bicycle store makes much more profit from selling lights, bottle cages, shoes, than the bicycle itself.

Additionally they sell tons of the accessories that can be used to turn a modern $1500 2160p60 video capable smartphone into something more useful for amateur/youtuber level videography, like smartphone gimbals, bluetooth lap mic/receiver setups, extra batteries, cases... Stuff like what the 'smallrig' phone cages do.

https://www.smallrig.com/ca/list/Phone-Rig.html

B&H is much more than just still photo cameras.

They are also competitively priced for computer stuff and you are sure they are not counterfeit which is not the case on amazon (especially but not only sdcards).

They sell professional photo and video equipment.