28 cents a pot shipped? Nope. We'd prolly be looking at $5.49 for $10.00 Plus shipping... looks like 30 would cost $7.40 to ship. So final after shipping cost would be about $.80 a pot. There are cheaper pots out there, that are a flimsy plastic (vacuum formed and such, generally recognized by a small flap over lip at the top). If you're looking for a long term pot, that will stand the test of time, use, and abuse I advise against those.
Andrew
Edit: D_m- Do you have some of those sitting around? Do you have an accurate shipping scale? I'd love to know how much 10 of them weigh (in oz) to help compare the quality.