Usually the best you can do is scab some from a cruisy lfs person under the guise of buying some caulerpa from their reefuge, at least thats what I had to resort to after drawing nothing but blank stares from everywhere I asked, you may have better luck of course as they seem to be discussed more in the hobby lately.Don't they sell Stomatella Snail here locally? (or not)
Must admit I now prefer the term to refugium, the important thing is that we stop the boats.Not sure if that was intended or not :p