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Upscalers for Retro Consoles
(rentadrunk.org)
Vintage gaming community.
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There's also the RetroTINK-4K if you'd like to take out a second mortgage. Personally, I prefer to just add HDMI mods and rely on my 4K TV's upscaler, or use FPGA consoles, but not everyone can do that.
Note that if those consoles include GameCube DOL-001 and a good upscaling TV, there's a very easy solution. A Carby will output native 480p over HDMI when booting while pressing the B button.
Just to add to the math, it really depends on what you own already and your capabilities to install mods yourself. Buying 3 pixelfx HDMI mods (shiny editions) will cost you around the same as the 4k (and that's if you can install yourself). Same thing as the analogue consoles if you want individual systems to play cartridges.
To add to the quality aspect, I have a 4k and I compared my RGB N64, HW1 N64Digital HDMI and RGB outputs, and Mister core as soon as I got it. The 4k looks better on my OLED than the HDMI output of the mod, with the only exception being if you prefer the smoothing filter in certain games.