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This is a riot: the U.S. Mint is selling dollar coins at face value with free shipping, which the bonus-program wonks figured out is a great way to earn frequent flier miles. Order the coins with a mileage-program credit card, get them delivered to your door, then dump them in the bank and pay off the credit card bill. The website allows orders of up to $5,000, which is a nice bundle of bonus points essentially for free. Well, free plus figuring out how to shlep five thousand dollar coins to the bank. (The FlyerTalk thread where this originates dates to last summer but is new to me and still viable.)