sundial snail

I have a large zoa infestation on my back wall (150-gallon tank). Looking for sundial snails, which I read eat zoas. But it looks as if they are hard to find because folks consider them pests. Does anyone have a lead where I can buy them?

I have palythoas that despite how many times I've tried, I just can't eradicate. The last time I tried removal, other corals ended up dying from the toxins. I am wondering if using Sundial Snails could work? I don't have any other zoas or palys in the tank except the ones I want gone. They are...