Frankly, TTI's ownership of Vax means constantly decreasing prices. You'll be lucky if the German brands fall so quickly. Cost prices are usually the number one attractant for most UK buyers these days, not collectors though - just average Joe.
Even now, whenever one of my friends asks for the recommendation of a "cheap" bagless upright or cylinder, I point them towards Vax's NLOS models. They're cheaper online of course, but even at franchise shops on the high street, you can find bargains aplenty. They may not last but that is a seldom "necessity" I find cropping up in conversations nowadays.