Wal-Mart, 
which took the plunge into the used video game business in March, is leveling up.
The retailer on Tuesday announced the launch of a certified preowned program in 1,700 stores nationwide, finally putting those games it has been offering store credit for over the last seven months back up for sale. It’s a move that heightens the growing battle between Wal-Mart and GameStop.
Chris Morris: Journalist 