Nope, it's not just you. I tried a monitor and there wasn't an option for the free shipping.
Try giving username DC_Support a PM to see if he can help you out. (I'd drop him a PM to find out what's going on, but if the deal is gone it's best for you to give him a shout... you might be able to talk him into something since the ad is still up ).
Any one else not getting the Free Shipping deal at DC ?
Just placed my first order (> $300) with them yesterday and the option for free shipping was not available, despite their banner stating "Free* Ground Shipping with orders over $300" (which is still showing on their website).
I wrote to them using the on-line form to ask for a refund of the shipping costs. :rtfm:
I'll let you know what happens...