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You can get games from legitimiate key sellers though (but you won't find l4d2 there). Humble Bundle, Fanatical, indie Gala, Green Man Gaming, or Amazon for example.
Your best bet is simply to wait until the next Steam sale.
https://isthereanydeal.com/
That should show them any deals out there.
The L4D games are even there with their sale information.
If Op hasn't already, add the games to your wishlist so you're notified about sales.