With the enhancement of the atari800 emulator to speak SIO to the FujiNet-PC (both can be build and run on Linux and Mac systems) all sorts of interesting possibilities come to the front. One of those is a portable Atari800, with FujiNet capability.
The FujiBoy.
The premium experience could be on something like a SteamDeck.
Or you could go for the people’s choice and use something like the MiYoo handheld device….
The MiYoo is available on Amazon for about $56. Loading on a800 and FujiNet is an easy copy to a SD card. Hop on the discord and ask if you get one and want to play with it. It also plays loads of other retro games.
Or you could go extreme and lose your eyesight.