Skinny, to the best of my knowledge and understanding, Castleberry does retail sales to individuals needing only a little product. Whether shipping would be a problem or cost prohibitive, I don't know. Your best option would probably be the liquid, rather than the solid soil.
And no, calling concerning legitimate sales inquiries is not a problem. That's what they are there for. Calling, posing as a potential customer, in order to obtain information was the problem.
Hope I answered your question.