i used to work for a glass distribution company and sometimes a company needs to get to the larger orders first before they sell a single piece to someone on the internet[the company i worked for never used the internet for sales. In USA that is a bust]. i mean they probably supppy stores and maybe other distributers so sometimes there is a shortage of certain pipes and they need to wait for one of their glass blowers to make that type of piece.
i guess what i am trying to say is that sometimes it may take a while especially when you are relying on a company who's employees are probably stoned more than half the time.