After I got me Starscream I went back and manged to score both Zarana figures. Same as with Starscream, 1 per house.
I had 4 google chrome windows open and 2 Internet Explorer windows on my work PC and a laptop I was rebuilding also had IE running. That and due to the nature of my job (IT support, remote managed clients servers, etc...) we have screaming fast internet here.
Hammering each link again and again was the only way I was able to get my stuff and as soon as I got Starscream I bought it on the spot, without waiting for Hasbro to load the other stuff because they have a check out system that will not "hold" on item in your cart.
Basically when they give you your conformation number, then you know you are good to go.
For the record IE sucked. I didn't have time to load firefox but google chrome was the only thing was able to hit any pages.