GTA IV, Dead Space and more coming to Xbox 360 Games on Demand

Some pretty awesome Xbox 360 games are on their way to the Games on Demand service this month, Microsoft announced today in a more formal fasion. Highlights include Grand Theft Auto IV and Dead Space. There’s more, however.
There’s basically a little something for everyone. All the dates can be seen below.
October 13, 2009
Grand Theft Auto IV (Rockstar Games)
October 20, 2009
Army of Two (EA Games)
Midnight Club: Los Angeles (Rockstar Games)
Sonic Unleashed (Sega)
October 27, 2009
Dead Space (EA Games)
DiRT (Codemasters)
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Did they announce the price for these? And this need to come to the PS3, my 360 only have 20 gb hard-drive, and I’m not buying one of their crazy expansive hard-drive.