Queries the current shop till and returns the amount
           
        Returns
           str -- Amount of NPs in shop till
           
        Raises
           parseException

def till(self):
        """ Queries the current shop till and returns the amount
           
        Returns
           str -- Amount of NPs in shop till
           
        Raises
           parseException
        """
        pg = self.usr.getPage("http://www.neopets.com/market.phtml?type=till")
        
        try:
            return pg.find_all(text = "Shop Till")[1].parent.next_sibling.b.text.replace(" NP", "").replace(",", "")
        except Exception:
            logging.getLogger("neolib.shop").exception("Could not grab shop till.", {'pg': pg})
            raise parseException