Yes, you can buy it cheaper without taking any risks. When you purchase from a third party, you’re actually buying a Steam account with the game, so your own account isn’t at risk. The purchased account won’t get blocked either, since you won’t be going online with it. You can buy the Silent Hill F Steam account here:
http://gamers-galaxy.com/product/silent-hill-f-pc-steam/ . They even provide a guarantee that you won’t get banned anywhere.