Which expansion to buy first?

[Odanan]

Rise of the Dread Moon and Against the Ogre Horde have the most interesting enemies, in my humble opinion. And you also get one new hero class with each of these boxes.

[Kurgan]

The Rogue Heir of Elethorn Hero Collection is still in stock and available at Entertainment Earth and BigBadToyStore, two of the major retailers for Heroquest. Don't sound the alarm bells just yet.

Good call! Amazon & Ebay aren't everything... and I would never pay for a premium Pulse subscription (not worth it in my humble opinion).