Where are these alternate heroes?

I'm new to the forums, and I keep seeing people talk about RC Wraith, Eternal Haka, Dark Visionary, etc. Where can I get these characters?

I got mine from my printer at work 

They are Promo Hero cards. They work with the same hero deck but offer a different base power that can really change how you play the deck.

You can get the real things by going to conventions and stuff!

Other than that, you will just have to print proxies from Board Game Geeks.

Ahh. Thanks!

If you pre order Vengeance when its ready in the store, I am pretty sure all pre orders will get The Greatest Legacy promo hero! That might have changed, but that was the story during the Shattered Timelines Kickstarter.

That is still the story last I heard.  That's why I'm checking every day until I see the pre order posted!

It's also been mentioned several times that GtG would like to produce a promo pack somewhere down the line with all the existing promo cards. They would have new art so that the existing promos remain special for those who went out of there way to get them, but they would be functionally the same.