They've gone to only showing listings for primers when they are available. A particular type of primer will pop up when in stock, then disappear again as soon as they sell out.
I believe the switch to removing out of stock listings was to combat those using bots to watch the out of stock pages.
I think PV has also limited primer purchases to 1 brick per customer, though I'm not sure if that's per day or per transaction, as I haven't purchased any from them since the panic started.
1000 isn't much, especially with the Hazmat tacked on, but it's still better than GunBroker prices (or prices here on the hide), and in theory allows more people access to at least some primers.