"Amazon.com does not have a price-matching policy at this time. We do, however, consistently work toward
maintaining competitive prices on everything we carry.

Please note that in some cases our Web site offers lower prices via the used and new offerings
available from Amazon Marketplace or Merchant sellers."

Source:

http://www.amazon.com/gp/help/customer/display.html/102-0623691-0552123?ie=UTF8&nodeId=468502

 

In practice, quoting the Amazon Return Policy to customer service can assist in obtaining a price match adjustment in order to avoid a return.