Ultimate American Express AMEX Bluebird / Serve Frequently Asked Questions (FAQ) DDG / January 26, 2015 All your AMEX Bluebird/Serve questions… answered!!! UPDATE Walmart has been offering 2x the price difference back if you redeem your “Walmart Buck$” to a Bluebird card. Unfortunately that promotion ends on 2/28/15 and has yet to be renewed. Share this post:FacebookTwitterFlipboardPinterestEmailLike this:Like Loading...