I personally obtained the below chips from casinos on Jeju Island in South Korea last month.
Jeju Island is referred to as the “Hawaii” of South Korea.

These casinos are very small and for foreigners only. South Korean citizens cannot gamble here.
I produced my US passport to gain entry.
Most of the casinos open around 6 pm and only one casino is open 24 hours.
I would guess 90% of the players are from China and 10% from Japan. There are almost no US or western gamblers that visit these casinos.
Hardly any of the casino personnel spoke English. None of the dealers I met spoke English.

To obtain chips you must sit at a gaming table, buy in and play.
The table games are blackjack, roulette (generic chips), baccarat and tai sai (sic bo).
During my visits only the baccarat and blackjack tables were open.
I played blackjack. I was required to play two (2) hands because I was always the only player on the table; everyone else was on the baccarat tables.
The minimum bet was $10.00. At one casino the minimum bet was $30.00.

Note: Since 2000 the S. Korean government changed the spelling of Cheju to Jeju.
The casinos have changed the spelling, although a couple of chips are spelt Cheju.

This is the Beluga Casino located in the Hyatt Regency Jeju Hotel in the Jungmun Resort area.
Here’s the front entrance.

This is a photo taken from their garden outside.

The Beluga Casino chip is over-sized at 44 mm.

This is from Lotte Jeju Casino located in the Lotte Hotel Jeju in the Jungmun Resort area.

It’s an H&C (RHC) mold.
The black circle above LOTTE CASINO is on both sides and on all the 1,000 denomination chips. I think it's a security mark?

This is from Paradise Casino in the Jeju Grand Hotel. This is the front entrance and its open 24 hours.

This one is from LVegas Casino located in T.H.E. Hotel and this is the entrance.

This is from Jeju Oriental Casino located in the Jeju Oriental Hotel. Here’s a business card.

This last one is from Ramada Plaza Jeju Casino located in the Ramada Plaza Jeju Hotel.

I have never seen these chips for sale on or anywhere else.
The Jeju casinos don’t want their chips walking out the door. They expect you to cash your chips in before leaving.

Please email me if you want any chips, I have dupes of some. 808kimchi at gmail dot com

Each chip is $7 and shipping is $2 in a bubble-lined envelope.
Buy two or more and shipping is free.
PayPal gladly accepted.

Trades are welcome for Korean casino chips/items not in my collection.