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Tried it out and the shipping was indeed free to a Hawaii address.  No expiration date stated so take your guess Through 12/15.  What I really like about this place is that they will hem the pants for you at no cost, just takes longer to deliver. 

QMX20X

http://www.qmuniforms.com/

*Offer good through 12-15-2014 midnight. Must Click Through Email to Receive Promotion. Percent and dollar off promotions exclude all products from 5.11 Tactical, Arc'teryx, ASP, Benchmade, Blauer, GoPro, Intoximeter, select Leatherman items, Marmot, Nike, Oakley, select Pro Vision items, Tommie Copper, Under Armour, Vertx and Whelen, except where otherwise noted. Items and pricing available are while supplies last. No backorders are accepted for clearance or discontinued items. This offer cannot be used in combination with any other offers, discounts or previous orders. All discounts are applied before tax and shipping charges and appear as a red line discount on the cart page.