You can search for Sellers via the Advanced link to the right of the eBay Search window. Scroll down to the Seller section and enter the ID and complete the Search at the top or bottom of the page.

On average, eBay takes between 10% and 15.55% of the final selling price in fees. This percentage can increase if you're selling internationally or using promoted listings. It's important to factor in all of these fees when pricing your items to ensure that you're making a profit after all fees are taken into account.

You'll receive an allocation of zero insertion fee listings every month. These enable you to list items for sale in many categories with no insertion fees, though other fees may still apply. You'll only pay insertion fees after using up these listings.

Amazon is the better choice if you're looking to reach a large audience and sell a wide variety of products. eBay may be a better fit if you're looking for lower fees and more control over your business.