Chess Incentives

I am an elementary school teacher trying to start a club at my new school. A couple of years ago while browsing the net I came across a site that had chess piece "dog tags" that could be used as incentives. There was a picture of each piece on an individual dog tag (i.e. a pawn on one...a knight on one...rook on another) I can not find the site or the items now and would like to purchase them to motivate the kids.

If any of you know where I can find these your assistance would be greatly appreciated.

Josh