I'm sure he means, where are they for sale. Strange indeed as they aren't listed on NewEgg or Micro Center. There's a couple of other online retailers I've seen listings but don't know if they as reputable as the former.
If you go on Asus' s product page, it's hard to tell what the difference between the EVO and the PRO is. Line by line in the specs are the same.
I was going to get either one at release but when the EVO was MIA I just got the PRO instead.