It costs around $15-$18 dollars depending upon your region. But the thing is PUBG is actually a paid game for PC, which is only available through the Steam server.
This game has a huge fan base, over 35 million players around the world, and a huge number of live stream viewers. As the era of Battle Royal games is going on and some of the Battle royal games are breaking the market with their huge popularity and fan following, Player Unknows Battle Grounds (PUBG) is surely the no.1 in demand.