Chips from Byblos Casino in Quepos has on it "Gallo Group" (they are the owners) and a graphic picture of a rooster, (unless there is a newer issue). Those chips are extremely difficult to find. I have two in my collection, $1.00 and the 1000c. Unfortunately, I have no traders. Hopefully, this info will help you find them.

Here's a link that has the chips shown. They are mistakenly grouped with the Kamuk Casino (also in Quepos and also run by Gallo Group).

http://www.caribbeanchipguide.com/chip2.php?primarykey=COSGAL&sort=type