The Spy vs Spy iPhone remake has hit the App Store, and it's 99 cents as part of a 50% off launch sale. After the (unspecified) time limit is up, you'll have to shell out $1.99 to take down your mirror-dressed counterpart.
As previously reported, this is based on the 1984 title for Apple II, Atari 400/800, and Commodore 64. It revamps the visuals and offers a new soundtrack, along with additional embassies, local and online multiplayer, leaderboards, and GameCenter achievements. If you happen to have fond memories of the old game, you can play with the original graphics and sound.