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GameFly / GameFly UK has some Indie Games on Sale for the Weekend for 50-66% off.
Sanctum 2 $5 / £4 (Steam)
Hotline Miami $5 / £3.49 (Steam)
Bit.Trip.Runner 2 $5 / £3.33(Steam)
Rising Storm $6.79 / £5 (Steam)
StarDrive $10