Gamblers General Store sells a bunch of different lammers --- see 6 pages of them at:
http://www.gamblersgeneralstore.com/store/Search.aspx?searchTerms=lammers&submit=true&type=AND

These new ones are selling for $1.25 each. The older ones, shown in RJ's pic, may be worth more, I don't know.

Lammers used on all types of games: poker, roulette, craps, 21, various tournaments, and to account for money / chips in transit to a game.

I've seen many of the lammers on GGS site in use, but have no idea on others.