Whenever I get a set that someone has converted to LED lamps I reflexively
then switch it back to incandescent it's one of those things that gets under my skin about as bad as a set that someone painted some random ugly color.
I'm pretty well stocked with bulbs thanks to an estate sale of a mid-century EE who had 2 mason jars of spares, but when I use that up I plan to hit up rockauto...When I was doing my 6V 1947 Oldsmobile I had a look at every part they had and found a number of radio bulbs it used for the interior lights were DIRT cheap compared to mouser, and better than bob's capacitor who was my supplier before the estate sale. I think if I browse around 40s cars on rockauto enough I should find almost everything I typically need for consumer electronics.