Want some remastered Sonic action for cheap? Well, Sega has put Sonic the Hedgehog and Sonic the Hedgehog 2 on sale. Both originally released as emulated versions, then later updated by a team including Christian "Taxman" Whitehead and Simon "Stealth" Thomley, both well-known in the Sonic scene. The remasters include support for high-definition and widescreen displays, tweaks to the original games, and features like characters and levels not playable in the originals (such as the lost Hidden Palace Zone in Sonic 2).
Both games are available for a limited time for $0.99, so be speedy - like a certain blue hedgehog whose name escapes me.