Check out the Specials section on Steam for great deals on games. There's also a "free to play" section. Additionally, look for pay-what-you-want Humble Bundles that are playable on Steam. They're often raising money for a good cause, but also offer good value.
How to get Free Shipping at Steam
All Steam games are delivered electronically.
What does Steam sell?
Steam sells downloadable games, software, hardware, and videos. Gaming genres include action, adventure, indie, multiplayer, racing, RPG, sports, strategy, and others.
Steam Loyalty Program
Steam does not have a loyalty program.
Steam Return Policy
Steam lets users request a refund on any purchase for any reason, so long as the request is made within 14 days of purchase and the title has been played for less than two hours. Some additional limitations apply.