Humble Bundle is the first thing I can think of that you should check out. In regards to building your Steam library this is an amazing two for one option.
They give a great choice of games to add to your library all at once in a great bundle. A bundle that I bought recently is the Lego super bundle.
They also have a Humble store that does sales all the time and just like steam Winter, Fall, Etc. Also you have the choice of donating some of your purchase to charity 🙂
Steam.DB is the place I go to check the best prices for games on Steam.Â
It has the price of all the games, it shows the player count of all the games, and most importantly it shows the all the record low prices of games, and compares to what the current price is. If you got your eye on a game, this is the best place to check. Also if you want to know upcoming sales or game releases this website got it covered.Â
It’s a great option for everything Steam and is a great overall database for it all.
AllKeyShop is also a great way that you can find games at all platforms. They are a trusted store with prices available from all around the world.
They have a very nicely and well performing built in price comparison, similar to how steam db does with only the steam store, AllKeyshop’s API goes a step further and uses a massive selection of platforms to compare from.