Different tiers of Investments are required for different tiers of Wholesale Business on Amazon. To start, you need at least 10,000 USD to start with, which includes the cost of registering a Company, making a website, and also for buying inventory. But the ideal Budget should be above 25,000 USD. Different kinds of Service Agencies require different kinds of Investments to start with. We at Sharks Ecom prefer Clients with more budget because more budget means more sales, more profits, and Better ROI.