Humble bundle is a place where you can get a game bundle for as low as 15 dollars. This is great because they have certain bundles with amazing games and you can get it all for one price. You can basically pay what you want but the minimum is 15.
They also have a membership where you can discover games for $11.99 a month and it is not a bad deal at all. Becoming a member gives you 5 pc games every month that you keep forever and allows you to save up to 20% in the store every month with is a great deal. If you are low on funds, or there are no games you like or already have, you can skip a month instead of canceling it or if you have you, you can cancel it which is nice. Every purchase that the site gets so much goes to charity which is nice.