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Get Games has Sonic Games on Sale along with some other random deals.
Sonic Adventure 2 $2.49 (Steam)
Sonic Adventure 2 – Battle Mode $0.74 (Steam)
Sonic All-Stars Racing Transformed $5 (Steam)
Sonic Adventure DX $2.24 (Steam)
Sonic CD $1.24 (Steam)
Sonic and SEGA All-Stars Racing $3.74 (Steam)
Other Deals:
Dreamcast Collection $7.49 (Steam)
Deus Ex: Human Revolution – Directors Cut $5 (Steam)