Coin counters is the term you are looking for. Someone here might have one, or you can google them. I thought I got mine from Mike's Arcade (mikesarcade.com), but I don't seem to see any there right now? Also, check out
this post where I first asked about coin counters. Some very nice people helped me out with them as well.
Good luck!
Edit: Darn memory.

It turns out I got mine from arcadeshop.com for $6.95. I have no idea how bad I got ripped off on that, but then again, I'm sure I've been ripped off worse before. They didn't seem to list them on their site, but when I asked in email they told me they had them.