Email Subject Lines: How Many Ways Can You Say "There's Still Time for Christmas"?

As we enter the last three shopping days for Christmas, online retailers are, in unison, sounding a "Last Chance" note in their promotional email subject lines. Here's a sampling of some of the ecommerce companies we watch.

They employ the whole arsenal of tactics: Encouragement ("there's still time"), urgency ("last chance!"), personalization, some ALL-CAPS and an exclamation point here and there, lots of free shipping pitches, and other angles. Which do you think are most effective?
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