We have created a new production addon for letting your vendors set a minimum order amount for their products.
The company profile has a setting in the Add-ons tab to establish a minimum order amount. When a customer tries to checkout, the sum of ordered products by vendor is calculated. If it does not meet the minimum order amount, an error notification is displayed and the user cannot checkout. The error message shows the company name and the minimum order amount needed for checkout for each vendor where the minimum has not been met..
Marketplace page is here (once activated)
Note that if you purchased this from us as a custom addon, please contact us and we will provide you a gift certificate for future purchases from our site.