Hi Charlie,
Yeah. The normally have prints for sale when the gallery show opens. If you were planning on going to the show, you should plan on a very long day waiting in line.
I don't know if they have any original art, but the way they have handled that is to first offer it for sale to people who attend the gallery show. Then, whatever is leftover, they put up for sale.
Whatever leftover prints go on sale on the website. The OG pieces typically have a "contact us" tag when they are available.