I recently bought a rack of these in the 3 denominations shown, just because they were cheap and interesting. Now I'm thinking it might be nice to have another barrel or two of the 25s and maybe some $500s too. If they exist... Maybe try and put together a little head's up set and not have to rely on the 50s much. But to post a wanted ad, I sorta need to know what I'm asking for??? Can anybody tell me what these are called?