GameStop has a Devolver Digital Sale going on.
Serious Sam 3: BFE $10
Shadow Warrior $10
Serious Sam HD: The First Encounter $3.74
Serious Sam HD: The Second Encounter $5
Foul Play $3.74
Serious Sam: Double D $2
Serious Sam 3: Jewel of the Nile $2.49
Hotline Miami $2.49
Serious Sam 2 $2.49
All titles above activate on Steam.