From Gardener's Supply (

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This Free Shipping offer expires MONTH, DAY, YEAR and requires a $55 minimum purchase amount. This offer cannot be applied to previous purchases or combined with any other offer. This offer applies to Economy Shipping only for orders shipped within the lower 48 states; it cannot be applied to items with additional shipping charges or faster shipping. To place your order by phone, use code 12345678. I would say that we should think of that as the current worst case and pad it with this many characters.