Going to destinythegame.com redirects you to choose where to buy Rise of Iron from, Amazon, Gamestop, or Microsoft. I choose Microsoft, and it takes you to microsoft's page, all good. But, the buy for the expansion is greyed out because it is stuck on the preorder. So, you choose to just by the expansion, nad it is only available as part of bundles. You click on bundles, and the only bundle available Is the $60 dollar version including everything. I just want the expansion, how do I buy on xBox? Or, when I get home, will the expansion be available for purchase on the store?