Right now at Fab, there's a vintage Scandinavian sale. Check those prices – it might give you an idea of the value you can still get on eBay. This Danish rise and fall pendant light really does emphasise that point.
You'll not find a £300+ price tag here, you'll find it for under a fiver. But for that money, you'll find a 1960s (possibly early '70s) light fitting in 'excellent condition', with a copper colour shade and compatibility with dimmer switches.
Just £4.99 right now, which is a bargain compared to those Fab prices.