Rich Burgel runs the Vegas-related memorabilia store in downtown Las Vegas, about 1/2 block from the Pawn Stars store (Gold & Silver Pawn). He has been offering these "mock-up" chips since June or before. I saw some of them in his store when I was in town for the convention.

He uses blanks of various molds and has inlay stickers made with the designs you see. He's pretty clear in his ebay write-ups that these are mock-ups / commemoratives / fantasy chips. The ones with closed casino names all seem to have open & closed dates. The "never opened" Atlantic City ones don't have dates, but were never real casinos anyway.

He does sell real chips too. You can see both types in his current listings of 29 chips at:
http://www.ebay.com/sch/Chips-/35743/i.html?_catref=1&_ssn=nevadamint&_trksid=p3286.c0.m1538

The price seems high for a single stickered fantasy chip (minimum of $5.52 each via ebay, perhaps less in person in his store), but to each his own.