Domain Mapping on Dreamhost

I'm trying to map a site and have had plenty of help from support but for some reason we can't get it working. I have the site mapped correctly a la support here but they claim that I have to have a unique IP, which isn't a static IP it's just unique. I don't want to get that feature at an extra cost if need be. Does anyone know anything about these problems? Right now I just get a page that says the website is almost there. Thanks for the help. is the domain in question.