Mirko Martino, the sale price provided by the vendor on the product page, gets displayed on the shop page also. Therefore customers can see this price on the shop page.
Now you can display the vendor their price deducted from the commission, but as there is no such field, hence you have to do custom code and add this flow.
If you have any developers, ask them to contact us so we can help you out with the coding procedure.
Alternatively, you may hire our service team (https://multivendorx.com/custom-development/) so they can add this feature in your site.