There are lots of good B2B Marketplaces with high Alexa Traffic rank in USA.
www.amazon.com + various national websites. E-Commerce and B2B2C Marketplace. Amazon is world’s largest online retailer and has lots of product lines, stores, subsidiaries in different countries.
www.eBay.com E-Commerce and Online Auction. One of world’s largest marketplaces for both individuals as well businesses.
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Business-opportunity-russia.com - B2B portal for Russia, Belgium and The Netherlands.
Best SA Exporters - Export Trade Directory