Yep, they're aquaculturing them. Not inexpensive though: the last 1" frag went for somewhere between 100 and 130 dollars. Not that I wouldn't grab one if I still had my florida biotope tank!
Something to keep in mind: Gorgonia ventalina doesn't keep its nice flat shape in most aquarium unless provided with broad, diffused laminar currentm (I think that's what I've read). If your flow is at all chaotic, the sea fan gets twisted.