I went to the Pain category, clicked on the Norco option, then clicked on the BUY button. "Out of stock" on all 4 Norco options, #90 and #60 7.5/325, and also #90 and #60 10/325.

In the same way I noticed that quite a few of the generic hydro options were not in stock either, although a number of them are available.

Hope this helps.