Heck you didn't even HAVE to buy EotN; I bought mine in a store and just instead bought a bunch of skills and that's how I got mine.
Here's a thought - there are gift cards you can put money on and use just like a Mastercard or Visa. That's a really easy way to buy stuff online, you just go to your local store that carries them, get one, put money on it at the store (in cash or from debit card), and then you go order whatever it is you want. Plus it's great for paranoid people who don't like to use their credit cards online because there's no direct link to anyone's account or bank.
Mastercard
Visa
I'm kinda ticked now that I didn't think of this sooner; I just found out about these when my husband picked one up as a gift for someone, and I thought "those are darned cool." I know this doesn't help anyone who's missed this last promotion, but it may help others going forward as well as give people a way to buy slots and skill packs and stuff now.