The truly excellent Raiden Fighers Aces is now available for download via the Xbox Live Marketplace. The asking price is $19.99, which is the same price the game was released at initially. While there's no markdown on the digital version, the cheapest you can find the game available is about $17 on Amazon.
Raiden Fighters Aces is actually 3 games in one, with classic Raiden franchise games Raiden Fighters, Raiden Fighters II: Operation Hell Dive and Raiden Fighters Jet. The game offers two player local co-op play as well as online leaderboards. Be sure to check out our review of the game from last year if you're at all interested in this one.
Source: Marketplace.xbox.com