I just got off the phone with that website and although the site asks you if you will be sending your magic band in to them or having them buy you a ticket to go with it - this is apparantly out dated information.
According to them, all their magic bands are now "link it later". She tells me I can purchase one, and have it activated upon arrival at the parks. In my case I have a vacation booked in Dec of 2015, so I won't be receiving my "basic" bands until November of 2015. Between now and then there is likely going to be new options offered by disney to upgrade the basic bands, but in the mean time - if I want my daughter to have an Elsa magic band I can apparently purchase one via the website and activate it upon arrival.