I'll sell to you, not going first though. I've got 20+ vouches in my RSGP shop.
Also, I sell 50 stones for $7.41. That averages out to $3 a mill. 49.4K (current price of stones) * 50 (amount of stones) = 2,470,000 (2.47m). 2.47m * $3 (Price per mill) = $7.41.
Edit: Nvm, dragonstones dropped. Price for 50 stones is now $7.24 cause they're 48.3K instaed of 49.4.