These were formerly imported from China and sold by an eBay seller named Wehonest. They may still have them. I bought a bunch of them 18 months ago along with dwarfs and control circuit boards--all from Wehonest on eBay. I don't recall pricing but the Amazon price looks about right. I don't know if Wehonest still carries them on eBay or not.
These are very simple and basic. The ones I got are short and had to be mounted on a simulated silver-painted lineside metal box to be the right height. But maybe these ones are tall enough as-is. At this price, you can't go wrong even if you have to fiddle a bit.
Don Merz
