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I used to remeber that AMEX used to have the Best Value Guarantee - where if you find a price lower than what you paid in 30 days they would refund you the price. They removed it on their cards (i think both fee and no fee) ... But looks like visa / mc have a similar feature for almost all cards (citi rebrands it as price rewind & even does the leg work for you!). Do any of the AMEX cards have it?
My Fidelity (Private client black one) card had it but not my green fidelity amex ... neither does my zync.