As many have pointed out in the thread, the Wind-up Dalamud minion can be obtained by purchasing the "Before Meteor" soundtrack from the Square Enix store. However, the codes for the minion (if I understand Squeenix correctly) were only available in the initial run of the soundtrack. I bought mine just before Christmas and when I did, there were only three left in stock. Two days later, they were out of stock and have been ever since.

I got my code in my soundtrack but there is a possibility that if you do purchase it now, the new print run will not contain the minion. (Which would be a pity...)

You can, of course, pre-order the new A Realm Reborn soundtrack which will come with a new Wind-up Baby Bahamut minion. I pre-ordered mine the day it was available and I'm looking forward to getting that minion in my collection too! (I love collecting them...)