Jjgames.com is known as one of the biggest pc games market allowing you to buy your favourite games with bitcoins.
You will get 5% discount on any games your purchase with jjgames.
They also have an option to pay via paypal but then you are not eligible for discounts.
While paying with bitcoins, use code (bitcoin) at checkout to get instant discount of 5%.
Used JJGames many times and its the best place to buy games via Bitcoins. The discount is true and only available for purchases through bitcoins. Their support is also good and clarify all the queries very fast.