Yes, productsourcing.com is a directory of wholesale suppliers solely for dropshipping within the US. They offer a free membership as well as a premium membership that comes with a monthly fee of $39.95 and features like a push to eBay Tool and data expert tool.
Unlike Salehoo, where all business transactions are done directly with the suppliers, you pay for your through productsourcing.com and not directly to the suppliers.
Hope the additional info helps. Cheers :)