Below you will see the many sites that offer Steam games at discounted prices or for free. I will list every site that I personally know of, there will be some people might not agree with. But in fairness, I will list them all to the best of my knowledge.
- Tiered Bundles that support charity with each purchase.
- Store with incredible discounts.
- A free game in the store occasionally.
- $12 Monthly Subscription that includes:
- $100+ in games a month.
- 10% off store(can be shared to a friend once a month).
- $2 wallet credit for purchasing the 3rd tier of a bundle.
- 60+ DRM free games to download and play(games do not link up with steam).
- Early Unlock feature that lets you purchase the next months subscription early to play the games offered, other games unlock at the beginning of the month.
- 24-hour sales on various games.
- Daily Login once the game changes.
- Points from each login that can be used in the onsite store.
- Otakumaker has its own monthly bundle on its main site, but the main focus of this site is the 2 child sites shown under the Bundles/Deals tab on the site.
- OtakuBundle has bundles that are a little more desirable at $1.49 each, I believe the bundles are a 9 games/DLC minimum.
- GoGoBundle has bundles of up to 33 games, ranging from 99¢ - $1.49. These games are a little less desirable, but some of them usually have cards or achievements. You can buy these bundles infinitely is i'm not mistaken.
- Fanatical use to be called BundleStars if you're familiar with that name instead.
- They offer a store with good deals on more popular games.
- The bundles range from $1 to $50ish from indie games to AAA titles.
- They also have a Pre-order section that are at a discount.
- They offer bundles that sometimes include games, music, comics, books & more.
- Some of the money from each bundle goes to charity if i'm not mistaken.
- Has a decent store, along with a account leveling system that enables discounts and raffles entries based on account level and status.
- This site's bundles are currently down due to some of the providers giving them unusable keys.
Bunch of Keys
- This site offers a single bundle with limited stock, they also have a giveaway page for a single game at a time. I've only ever seen it have a giveaway for a copy of Counter-Strike: Global Offensive.
- Onsite currency used for various things on the site.
- Store with discounted prices.
- Auction page with bidding options.
- Giveaway page.
- Trading page.
- This site has a thing called Happy Hour when buying bundles. I've never bought a bundle from this site, but I found a video that explains it and shows an alternative that I will personally be using from now on.
Lazy Guys Bundle
- Has a single bundle that has an option to buy 2 of them for ~5% off.
- Has a "top contributor" price from $5.99 - $99.99, this enables you to win either $30, $20 or $10 in steam games depending on your place in the top 3 respectively.
Green Man Gaming
- Disclaimer - This site has a somewhat bad reputation on the reddit groups for steam games, but I cannot figure out why. I've personally never had an issue with any game I've bought with this site.
- VIP section for registered users, doesn't cost anything. Offers a few discount codes for select games.
- Has games for PC, Playstation and VR.
- A GMG giftcard section.
- Currently has a $50 bundle that includes very good games for the price and is aimed toward charity.
Direct 2 Drive
- Game Store with all kinds of genres at discounted prices.
- Publisher Promo store with discounted prices.
- D2D Rewards - 5 tiers that are acquired by purchasing games, highest tier is $59.99 and rewards you with a minimum 20% discount.
- D2D Trade In - after buying a trade-able game on D2D, you can trade it off for a different one.
- D2D CloudPlay - Game streaming incase your PC can't handle some games.
- They offer games on the Playstation network.
- Has a store with decent discounts.
- A $1 or less section.
Grab The Games
- Shows Deals on a lot of various websites.
- Deal Tracker.
- Giveaway Section.
- Arcade Games.
- Giveaways that can entered in using the points you get from being a member of the site.
- You get a "Contributor Level" by starting and giving away games.
- Some giveaways have a higher level to enter.
- Offer wall for points on-site.
- Various Giveaway Pages.
- Shop with decent deals.
- 24-hour long giveaway with an amount of keys per hour.
- $3.99 per 30 days membership that includes:
- Disable all advertisement on orlygift.
- No CAPTCHA check before entering a round.
- V.I.P. Badge on your orlygift profile.
- Automatically enter each round on orlygift.
- Very high chance to win!
- Save your money and time and get awesome games.
- Standard store with decent discounts.
- Quests page that is an offer wall for on-site points.
- A "Trove" that you can spend the on-site points in.
- Giveaway Page.
- Arcade Games.
- Play games that the site is partnered with and submit screenshots for point on-site.
- Offer wall for points.
- Point Store that includes items for various games, gift cards, steam wallet codes.
- The Key for this site is patience, anything steam related takes awhile to come through on the point store as their providers take forever to get back to them.
- Complete Offers/Tasks for on-site points.
- Giveaways for on-site points.
- Referral Section.
- Shop that has Steam games, gift cards, various skins on various games.
- Offer wall for on-site points.
- Store for on-site points.
Daily Indie Game
- Regular Store with severly Discounted games.
- On-site point store from buying on-site points or selling your own keys on-site.
Oy Vey Keys
- Purchase games with on-site points earned from trading in CSGO, TF2 keys or trading cards/sacks of gems. An offer wall is also available for earning points.
- Site seems shady as it is very bland and basic but I've not had any issues with it yet.