They're sold at every single Goth Gap...sorry, Hot Topic store. I've actually got two pairs of the pants and two skirts. The straps are detachable though, so they could be left at home. However, since they are allowng other stuff, this seems like a rather silly thing to ban, most people don't even know what they are.
"Those freaky preps can just march over to Deb and leave us alone!" LOL