The only one I've bought was the Predator 2/cloaked Berserker set...and I want to say it was $35 or so? I'm sure someone will correct me, but it was around the price of buying two figures.
I also read last night that wave 2 will include a couple more marines, but now I can't find where I read it. THey also went into how they don't have the likeness rights for all the marines, and Ripley as well, but pointed out how long it took to get Arnold's rights, so they aren't giving up.