I have about 10 right now, all of which I think I got back in the day when the game seemed to allow me a black lion key every now and again. 10 stones should be enough for me at 80 for a while, but I think another 10 could come in handy. I'm not entirely opposed to just using the BLTC to get more, but I'm wondering if there's a consistent way to do it. Like a karma vendor that sells them maybe?
I'm stacking locked chests to the ceiling and don't expect to be throwing out emptied chests any time soon. Just wondering if there's another way.
"When life gives you lemons, shoot them back at life at high velocity." - Asura Advice Column