Overstock takes aim at Amazon

Discount online shopping site Overstock.com has lowered prices on books and is offering a 15% bonus to loyalty members in what CEO Patrick Byrne is calling a price war with Amazon.

"We will analyze the results and cost benefits of this price war against Amazon and decide how long to continue the promotion. Right now it's scheduled to last through Cyber Monday," said Byrne.

The membership in Overstock’s Club O loyalty program can be purchased for $19.95 per year. Members receive free shipping and Club O Rewards of 5 to 25 percent. These rewards accumulate and may be used on future purchases. All books have been set to earn 15 percent rewards for the duration of this promotion.