Well for me on PS4 they're not that hard to get so I wouldn't pay an awful lot. I think this is different though for PC players, since PC has a larger playerbase. From what I've seen on other threads PC players are paying 200-500 coins per VR15 mat.
Edit: Goats. Kill lots and lots of goats.
Edited by Fat-Larry-Makes-All on November 23, 2015 2:55PM