The Internet is a great place to buy and sell collector's items like marbles. To find marbles on eBay, begin at the eBay home page. On the left sidebar, hover over Toys & Hobbies. When the menu expands, click on Collector & Hobbyist Toys . Scroll down to the heading All Categories within Toys & Hobbies in the main frame of the page. Near the bottom of the third column is the link for Marbles . There are two additional links beneath that heading. One links to Pre-1970 marbles while the other is a link for 1970-Now . Marbles for kids are found in a separate category as well. Use the tools in the left sidebar to narrow results even further.