Oh... even though it says it is a few bucks, for the first two hours it is actually free... When you check out it doesn't charge you anything on the credit card, and there is a checkbox to disable auto-renewal.
Got one as well. Clicked on $2.88 Family Plan and it came up $0.00 as well. Be sure to uncheck the Automatic Renewal Option at the bottom of the page. Don't know if I will take advantage of it, but now this is an option. I wonder if you could treat it as cloud storage and access from your cellphone as well.