Interesting that you are looking for such things.
I happen to know of one, which has been discussed before and I have a very good relationship with them also. Link hidden: Login to view
Now they are basically a wholesale outlet, and are going to be opening a direct(drop) shipping service. I know them personally. One of the best I've ever worked with. I hope Salehoo checks out people like this and adds them to their official directory, sellers of all size have been looking for suppliers who are as direct and personable as they are.
No minimum orders, you can order only one or you can order whatever is in stock. Also any of the shipping rates....that I've ever been part of anyway, have been completely phenomenal. I've found 80% of my suppliers outside of salehoo. There is a whole world of them out there, once you know what you're looking for. Thank goodness.