Just for $9 I have bought CS:GO at around 15$ and in this bundle there are three games including CS:GO.
How you have managed to provide such price. Will there be any chargebacks? There is lock down period of 30 days from the date of purchase in steam to wait for chargebacks.
Yes, OP, are these legal methods? Not doubting you or anything, but you are a newbie. Will you provide a warranty, or maybe use escrow? I don't think other sites go anywhere near that price point.
(Which is a great discount, your low price point is a good thing! Keep it that way. I'm just wondering.)