I started reselling at 14. Like most people starting out, I learned who the good vendors were the hard way — bad quality, sellers who ghosted after payment, contacts that turned out to be dead ends. It cost me money and trust before it ever made me any.
Since then I've scaled my own reselling business past $50K in profit, and I still run it today. Every vendor on this list is one I've personally tested and bought from myself — not just added because someone said they were good. LooPlug is the resource I wish existed when I was starting out.