Hi, I want to make a classified ad site with commerce capabilities (like eBay). What are the best options?

You can purchase the UltimateWB Full software to get the e-commerce, classifieds, and other social networking built-in apps.  You can read more about the features available on our features page at https://www.ultimatewb.com/features .  Here is the User Manual Classifieds section: https://www.ultimatewb.com/classifieds-app .