http://www.storybundle.com apparently brings up different combinations of eBooks every now and then, and at the moment they've got quite the shiny collection of video game books:
The Making of Karateka by Jordan Mechner
Kill Screen Issues 2 and 6
Confessions of the Game Doctor by Bill Kunkel
Constellation Games by Leonard Richardson
Killing is Harmless by Brendan Keogh
Generation Xbox: How Videogames Invaded Hollywood by Jamie Russell
Pay at least $10 for:
Videogames: In the Beginning by Ralph H. Baer
The Making of Prince of Persia by Jordan Mechner
250 Indie Games You Must Play by Mike Rose
Phoenix: The Fall and Rise of Videogames by Leonard Herman
Constellation Games is actually a work of science fiction; there is a gushing BoingBoing review here:
http://boingboing.net/2013/02/20/con...-debut-sf.html