I searched SOGs catalog for them but nothing turned up, except that they have .308 FN-49 mags for $39.95.
I just saw it in their most recent flyer. I imagine if you give them a call they could let you know if they are still in stock. I doubt they flew away that fast, then again, with the way things have been going, they might've.
I'd score one but I've been sinking money into an FAL as my most recent project and I'm pretty well tapped cashwise.