I am not sure if the previous post deals with limits on savings bond purchases imposed by American Express OR by the Treasury. I don't know about AMEX, but as for the Treasury, you can easily evade the yearly purchase limits (15K E and 30K I, IIRC) by putting your mother's, father's, kid's, or wife's name as the first owner of the bond and yourself as the second owner.
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The month of October promises to be GLORIOUS!