Really? It IS ok to shop somewhere besides the VZW store. There are plenty of places that sell, if nothing else, a universal car mount that will work with the eris.
I hate to get in the middle of this, but you gotta relax man. She didn't say that there wasn't anything. Only that there is no information regarding one. Nor did she say anything about only shopping at VZW. I try to stay out of these things, but you kind of jumped in there just to smack someone for no reason, and then offered nothing useful in return. If you know of a product that fits the OP's needs, speak up and tell them. Don't just hit and run someone else for no reason.
Play nice in the sandbox.