The dev, Farsight, has lost the license for all Williams and Bally tables. After June 30, you won't be able to buy those tables for the game any more. Any tables you own you will still have. Also unfortunately, Farsight wasn't allowed any final sales, so everything is full price. AND, Tales of the Arabian Nights, the first free table in the game, will disappear if you don't own it already, getting it for free won't keep it.
So, you've got less than 48 hours to make your final purchases. They've jerked the DLC out of the store, I've just noticed, because of course. So if you want to purchase, in Steam anyway, you have to do it from within the game. I don't know how it works on the consoles.