I just took a hot stone class and am excited to give it a whirl. Where do most of you get your stones? I found a place online rubrocks.com but I really would like to pick individual stones and shipping is as much as the rocks. I went to a landscape place yesterday thinking I could find what I wanted there. I wasn't thinking of the fact that the ones sold specifically are all smoothed with a tumbler. Anyways ideas? Some secert source sharing plz.