One of the places we always try to visit when we're in Southern California is Solana Succulents. It's hard to believe that Jeff is able to get so many fascinating plants in such a small space. Jeff Moore (third photo) is the owner and I certainly recommend a visit to his nursery if you're in the area.
Finally, if you can help us identify this plant. It certainly looks like an Opuntia or certainly of the Opuntiad family, but I'm not familiar with one that has this particular hairiness. And if it has glochids, they certainly aren't a bother. I just handle it with my bare hands with no problem. Jeff hadn't been able to I.D. it and we're not doing much better. Help!