[quote name='Kaito-kun']Is that legal? If not then no.[/QUOTE]
Third Strike for the Dreamcast is essentially a collector's item by now, it's gonna be expensive unless the seller doesn't know what he's selling (I'm guessing it would go for at least $30 bucks). If you're so morally appalled by emulators and any other practical way of getting a copy of the game, then just wait for the PSN/XBLA release.