I have found this ebay supplier to be a useful source of vintage electronic parts.
https://www.ebay.co.uk/sch/vannadiy/...53.m2749.l2654
They sell a range, but with a strong bias towards glass components.
Nixie tubes, many types.
VFD displays.
Magic eye indicators, several types.
Neon lamps, numerous types, including b22 nightlight types.
Some specialist gas discharge lamps, including 28volt mercury lamps.
A few types of valves but not primarily a valve dealer.