I just received an email from the Hilton that included the announcement below. I have NOT gone there to verify that the chips are actually available....so you may want to call before making a trip there.

40TH ANNIVERSARY CHIPS ON SALE NOW!
For 40 years we’ve been your place to play, and that’s why we’re offering commemorative 40th Anniversary Gaming Chips! Winning is great, and so is taking home a piece of Hilton history. Get here soon because they are only here while supplies last!