you could look at getting a Pandora device off AliExpress (or eBay) - it's basically a set of two arcade joysticks with all the emulator stuff built in, not quite the same but a lot cheaper and doesn't take up as much space
I built one years ago and got rid of it when I got married.
I basically bought an old arcade cabinet of e-bay for about £20 and put an old pc in. I got all the joysticks and buttons replaced from analogue to microswitched ones and attached them to an I-PAC board, which basically allows switches to be used as keys. Ultimarc is the company that produces the interface boards, if you know what you are doing then they are quite straight forward to use.
This is the 8" Picade - we also stock the 10" version. The ultimate desktop retro arcade machine! Picade is a Raspberry Pi-powered mini arcade that you build yourself, with authentic arcade controls, a high resolution 4:3 display that's ideal for retro gaming, and a punchy speaker to hear those...
Although i've barely used it since i set it up! Its relatively easy to find Full SD card images online which have every game on every platform you can imagine.
I have an RPi that I put into a 10 quid Ikea square table so I can play on a proper coffee table. Second hand dell monitor, so the whole thing costs less an 100 quid and I have about 100 games I can muck about with on it.