Trying to find suitable plugin or theme for a marketplace - multi sellers, one buyer.

We have been approached to setup a website, similar to ‘CEX’ in the UK whereby the customer sells their item to the website, they are sent a Postage label to send their item off.
On receipt, if the item is as described, buyer receive money via BACS transfer.
We are looking to see if a plugin can do it ,or if it needs to be a full theme.
Preferable with WP Bakery/Visual Composer.