Finding them in an arcade machine is one thing. Winning them is quite another. I mentioned it somewhere else, but I actually had a streak of actually winning these things (three times I tried I actually won... twice in one day, actually) and NEVER won anything ever again ever ever. Not to mention those awful times when the thing's pressed up against the glass, almost mocking you.
Of course, there's always the alternate route... if you see one hanging on the walls of an arcade, you can take a couple hundred dollars and play whack-a-mole or something until you get the 20000 tickets to get one.