Found this while logging into my Amex Account.
Valid for both their online and physical stores
(Thanks to overtaker for confirming its valid on its online store)
Apple
SHOPPING / Spend $500 or more, get $50 credit
Spend $500 on the saved Card in one or more transactions at Apple, before 30th June 2014 to receive $50 statement credit. Limited to first 5,000 Cards to save the Offer.
OFFER TERMS
Offer only applies to spend on this Card. It does not apply to spend on any Supplementary Cards on this account or any other American Express Cards you might hold. Supplementary Cards qualify as an Eligible Card only if the Card is saved for the offer separately.
Card Members must register by saving this offer to this Card and spend $500 or more on their registered Card at Apple, in one or more transactions, between 4th June 2014 and 30th June 2014 to receive a $50 statement credit.
Participation is limited to the first 5,000 Cards to register.
Purchases made through resellers are excluded.
Offer excludes: Apple Gift Card products.
Statement credit is normally issued within 3-5 days of the eligible spend, but may take up to 8 weeks to appear in your account.
Statement credit may not be applied to your Card Account if it has been suspended or cancelled and may be reversed if qualifying purchase is returned or cancelled.
Full terms and conditions available here
Hmm, not in my account..