Here are some of the best multivendor ecommerce themes that i came across. I purchased each of these multivendor themes and tried them all out for about a week and came up with this list.
Multivendor eCommerce tutorial: https://www.youtube.com/watch?v=p9jXInqP5j0&t
Free Themes (But With PRO)
There are some honorable mentions like woodmart as well
Woodmart Theme: https://www.darrelwilson.com/woodmart
All the wordpress themes in this video i have purchased and fully tested. Let me know what you think about my list and feel free to visit my website at https://www.darrelwilson.com