Good luck with that one. The classic arcade machine market is in the same situation as the pinball market right now. Lots of demand, small amount of supply and lots of scam sites galore. The biggest problem is the CRT monitors those classic games use. They are no longer being made and are getting hard to find. It's one of the reasons why the Arcade 1up machines are a big hit.

Personally, I recommend getting a Multicade. You don't have to go after a giant 4,000-in-1 machine. You can get a custom one made built to your liking. There are quite a few custom multicade shops out there. For example, you can get one built (from the ground up or using an existing cabinet) that looks like a classic 6ft arcade cabinet with working coin mech and has just 6 (or 12) games loaded into it using an actual arcade standard JAMMA board.

Search craigslist for arcade. You may find someone in your area making them.

LTG : )

CRT monitors are not hard to fix. If you don't have the skills to repair them, there are several techs that repair the CRT monitors for a living.
Get yourself a cabinet with an authentic CRT monitor, forget the LCDs. Then for a multi-game board, look into something like the BitKit FPGA board.
https://forums.arcade-museum.com/threads/bitkit-fpga-40-games-more-to-come.373372/
http://craftymech.com/

Take a look on the arcade museum forums. Plenty of arcade games constantly being bought, sold and traded.
https://forums.arcade-museum.com/

Check your local Facebook marketplace. Tnt amusements in Philly is legit and they ship.

Ms Pac-Man Galaga class of 1981 is a great combo. If you can’t find an original CGC is still making them under license with Namco.

https://www.chicago-gaming.com/arcade/ms-pacman-galaga

Another great option IMO is an Ultracade by CGC. They are commercially built cabinets with CRTs and have various game packs you can buy. There’s also some upgrade kits available out there that you can buy that add several hundred games to the lineup. The OS is very intuitive, has a nice graphical interface, and the emulation is pretty good considering for all of the games. Of the Multi games I’ve had over the years this IMO is by far the best and the only one I’ve hung onto. They come up on Craigslist fairly often although like others have mentioned, the prices are just as crazy on the arcade side.

Klov isnt too wild about multi games. Arcadecontrols is better for that. The Ultimate Arcades are good quality multis, I personally think those beat-em-ups you listed get old quick in a home environment. While they are JAMMA and boards can be swapped in and out, the price they command might not be worth it unless you really like the game

I would check out this Facebook group

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Damn it, Autocorrect! That supposed to say "find", not fix. As is it's hard find a CRT that doesn't have any burn in.