I think only F-R currently. Jayco had one in their line last year, maybe three a few years ago, this year they've trimmed popup offerings way back. Models you see this year are those that sold last year.
Popups, particlarly high-trim (and all highwalls have been high-trim) have become difficult to sell because of price overlap with newer small lightweight TTs. So say two different dealers here that stopped selling them in the past two years.
But it seems to be mostly about price, since used PUPs priced $3500 to about $5000 sell almost immediately.