a factory makes them. Ray gets them from him, and then sells on Aliexpress to whoever wants them.
He's sort of a middle man, but there's more risks when dealing with a factory, as they generally don't sell on the express side, and expect you to purchase in larger quantities. (like add on a zero or three onto what you normally would order.)
I feel at the moment the safest bet would be to stick with Ray. just think, that first factory could be selling those nodes they made originally through other people and they might even be the same quality. If you find them through someone else, you most likely will get the IP67 knid, and the headaches that we started off with.