Hi Mike, welcome to the forum,
You might find some that will share that sort of information, but the most experienced will usually guard their very best suppliers information very well. Of course, the last thing they want is to introduce new competition for themselves into the marketplace, so they won't see any advantage in openly providing details like that, especially when most have spent countless hours researching through trail and error to find who they are now happy to be dealing with.
Most experienced sellers will see it as earning your place in the land of e-commerce through all the many hours of research it usually takes to get established.
That said, all the suppliers listed in our directory have been fully verified as completely safe to trade with, so you can find lots of supplier resources there to get you started.
Good luck with the new venture!