MoMFollow

So, I started playing the game like, after Mines of Moria came out, and played it off and on until this summer. I stopped playing, but have came back for the Welcome Back Weeks, and with the $199 lifetime subscription offer up again, I can't let it pass (again). And I figured I'd get the pre-order Adventurer's Pack thing too.

My only problem is, I've never actually bought MoM. I saw on the website where I could pay $10 to download it, but I already have the game cd's installed on a few computers, I just need the activation key for my account. Is the above-mentioned download the only and/or cheapest way to get the key?