GiveItToMeFor me, Discover and AmEx. Visa and Mastercard might also, but my AmEx and Discover give me the best cashback rewards so I use those primarily. Discover has price protection where they will refund the difference up to $500 if you can find the item cheaper at ANY store within 90 days. But I suspect that won't be needed with the 34UM94 as I doubt it'll get much lower than $850 any time soon. I could be wrong, though.