Humble Bundle offers its Humble Unreal Engine Bundle for whatever you want to pay. If you OPT for the minimum of $1, you'll get Killing Floor with DLC, Dangerous Golf, and Shadow Complex Remastered. That's $54 under what you'd expect to pay on Steam.
If you opt to pay more than the average (currently $4.07), you'll also get The Vanishing of Ethan Carter, ADR1FT, and The Mean Greens: Plastic Warfare. That's an additional $50 savings.
Donors of $10 or more receive The Culling (currently in early access). That's an additional $15 value.
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