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Steam has Skullgirls on sale for 50% off as the daily deal for 4/23/14.
Skullgirls $7.49
Skullgirls 2 Pack $12.49
Skullgirls 4 Pack $22.49
Skullgirls: Squigly $2.49
Skullgirls: Color Palette Bundle $2.49
Skullgirls: Big Band $0 for a limited time