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Click on offer, then click on the link on the offer page to receive an email with the promo code. Sign-up for this offer expires on March 24.
You'll get an email (right away), a link to the Special Offer page and a promotion code to enter at checkout. Once you have the promotional code, you have until April 24, 2012 to complete your purchase. Like previous offers, this one requires you to use the full checkout process in order to enter your promotional code. Also, like all Amazon sales that use promotional codes, if you have a gift card balance, you must use it for the payment (if there is not a sufficient balance, then you can pick which credit card or other payment to use).
Limit one offer per customer and per device.
Shop early, of course, as their selection often dwindles as the offer goes on. Also, I checked the prices yesterday and there has already been a $5 drop on The Girl with the Dragon Tattoo (Three-Disc Combo Blu-ray / DVD + UltraViolet Digital Copy). As with any pre-order, you'll get the lowest price between the time you order and when it ships, so you might pay even less.