You can buy one of those Retro Arcade Pandora boxes on Aliexpress, not the motherboard, the ready 2 player which look like arcade controls. From what I know they seem to be quite good, didn't test one out myself though. It's easy to hook to the TV and doesn't take much space compared to a whole cabinet, and obviously a lot cheaper.
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This is probably the one you saw

https://pandoraplatinum.com/

They are a US company specialising in making emulation arcade controllers. The hardware running it is a bit like a Raspberry Pi but not as powerful. Their latest versions seem better than before with even an SD card shot to add your own games without having to hack the hardware.

And as DC said AliExpress sell knockoff copies of their setups. There are other similar setups from many other companies to.

The other route is to use a RPi and connect up seperate controllers.
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