i had salehoo account before, n I can say it worthless if u wan to sell thru dropshipping method. Price too steep and products can be found much cheaper in ebay auction....
As for WWB, I believe it the same old story, only picture they painted is much colourful.
One method my cousin tried some time ago was that, he actually advertise a small column in the local newspaper and offer to sell overstocks, old stocks or closeout products for local merchants.
Cost= Time+adv. fee+small shipment