Advertising is not allowed but discussions about and recommendations of sources defintely are allowed. So as long as the source is not your own business you can tell us. My sources so far have been Cactus Limon, Ebay, Bob Smoley, and Grigsby's.
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Lest not forget glasshouseworks.com, not inexpensive but nice plants. Also, aridlands.com has nice Sans. suffruticosa cheap

You have named most of the same places that I get mine, the other place I get mine is the Huntington Gardens, they offer them rarely, on the ISI list. I got a nice S. arborescens, I think it was 2 years ago, it seems to be a slow grower, but easy to take cuttings. I went to the National show and sale today, the vendors offered a few species of them there. Norma