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GameStop has Ridge Racer Unbounded on sale for $5 (75% off) as the daily deal for 2/6/14.
DLC for the game is also on sale:
Ridge Racer Unbounded – Ridge Racer 1 Machine $1
Ridge Racer Unbounded – Ridge Racer Type 4 $1
Ridge Racer Unbounded – Ridge Racer Type 7 Machine $1
Ridge Racer Unbounded – Extended Pack $2
All require Steam activation.