Almost all the baryta papers are discontinued, Canson Infinity, Red River, Ilford, Innova, Epson, Perma Jet, Hahnemuhle.. Some papers called "baryta" or "baryta-like" which did not use traditional baryta coatings are still on the market, Hahnemuhle Fine Art Baryta, Hahnemuhle Photo Rag Baryta, Breathing Color River Stone and so on.
The only paper claim using true baryta coating and did not be affect is Canson Infinity Baryta Prestige. Don't know why. Now the new CI's Baryta Photographique II is shipping. Did not get yet.