You're looking at >$100 for a small frag. The way to tell if it's cespitularia is the sclerites (see "show off some softies" thread). If you look at it parallel to the incident light (i.e. from the top with tank lights on, or straight on while shining a flashlight on it) you'll see the telltale shimmer caused by the sclerites. If you're lucky, the vendor doesn't know what they have. It's growth form is like "regular" xenia, not single stalks coming out of a mat of tissue, like anthelia.