They come up on ebay fairly frequently. One sold on ebay on August 30th for 99 cents. Look for completed listings. You can get some information about the casino on the Chip Guide:

http://www.themogh.org/cg_chip2.php?id=AWPBC2

If you have any other specific questions about it or the Concorde, feel free to send me an e-mail. I will tell you what I know. Meanwhile, you have a nice chip!

Michael Siskin