Recently there are many platforms where you can buy different weapons for CS game, but if you want to buy AWP Atheris, then visit this website https://dmarket.com/csgo-skins/product-card/awp-atheris. Here you can buy this weapon at a good price and you can start playing with it. Personally, I have bought weapons here and I can say that it is a very cool and reliable platform to buy weapons for the CS game