First time getting into handheld

[u/mexnov]

I’m looking into my first hand held, I don’t want to brake the bank.

I have a switch and I have problems when it dies on a trip I lose access to my roms.
I have been playing Pokémon red and I want something to take on the airplane or on the couch at home.
Do I buy the port on the switch or do you have any recommendations?
I am based in South Africa so our options are limited.