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Humble Store seems to have a daily deal now.
Daily deal for 6/10/14
Prison Architect $9.89 (Steam, DRM Free)
These deals expire in 20 hours
Samorost2 $1.24 (DRM Free)
Cloudbuilt $10 (Steam, DRM Free)
Bloop $3.24 (DRM Free)
Other Deals:
BROFORCE $12
RPG Maker Weekly Bundle $25 (Steam, DRM Free)