You can colorful ones without spending more than $2 a polyp. You just need to make friends in your local club. But what happens with zoas and polyps is someone will create a colorful name and then it becames all the range to get them and people pay more. To give an example, a coral guy I know had some pretty pink polyps that weren't fetching that much attention. He gave them the name Electric Raspberry Splash or something and all of a sudden he had a waiting list for them and people were offering silly amounts per polyp. The common names of many zoas came about in this same way I imagine.
For me, I get what I like and don't worry about the common names and I don't always look at just the color of the zoas I'm wanting to buy, but the ones I already have and how they'll look in contrast to one another. Sometimes it is that contrast that makes a seemingly ordinary one extrordinnary in your tank.
