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If you have any Amex business cards, log in and check your Amex Offers for the above deal. This appears to be very highly targeted. I found this only on 1 of my dozen or so Amex business cards.
Note that even though it says that it is for “AT&T Small Business Wireless” I’ve found with previous offers that it works to pay my personal AT&T wireless bill. And AT&T lets you pay in part or overpay to apply credit to future bills, so you can easily apply exactly $150 to your bill in order to maximize this offer.
See also: Complete guide to Amex Offers.
Hat Tip: Doctor of Credit