maybe you need to build one yourself by getting a board and copying the program from the memory and transfering it into an empty memory on your board.
i know some of those units allow for different games to be loaded on the same board.
i dont remember how the information for the game was stored, but they would load a new game and put up new stickers and a sign to make the transformation complete.
i remember them saying sometimes the board was too old to be compatible with the game they wanted to load.
but arcade machines have had time to mature, so you should be able to build an empty one and load the program.
getting the stickers for the outside of the cabinet might prove to be hard to find.
but maybe you can take the picture and have a professional printer make a copy of the sticker.
that is what professional printing companies do.
they make stickers and laser cut plastic/metal .. maybe t-shirts too.
you might be able to build the game cheaper than buying an old version.
getting the software of the game is kinda the same as getting a cd or dvd of a video game for a computer.
it is the data you need, and it might come in the form of an atari or nintendo cartidge
or
you have to program the memory chip yourself.
it might be worth a good look if you can setup options for yourself.
maybe higher output speakers (and higher quality amplifier/speakers)
or
maybe an LCD screen to replace the old CRT screens?
might save some money on the electricity bill.
or
you could go out and get one of the bigger screen versions of the arcade machine.
not all of the arcade machines use the small CRT monitors.
games like 'primal rage' or 'tekken' came with a newer design that uses a much bigger screen.
the joystick area was seperate-like and attached at a distance from the screen.
this is the cabinet i was talking about:
http://cgi.ebay.com/TEKKEN-TAG-BEST-FIGHTING-ARCADE-GAME-MACHINE-LQQK-/270754940407?pt=LH_DefaultDomain_0&hash=item3f0a4085f7
but i think i have seen bigger screens than that.
i only suggested it to provide a bigger screen, and you might want it to be exactly like it was in the past.
i dont know if they make empty cabinets anymore.
but
you should be able to get an empty cabinet and build it piece by piece, as parts should still be available for restorations and collectors.