Wholesale Discounts by User Roles for WooCommerce is a free plugin that lets you apply percentage-based discounts by user role, manage custom roles, hide prices or entire product pages from guests (catalog mode), and import/export discounts via CSV.
Simple to set up, flexible to use, and perfect for WooCommerce stores that sell to both retail and wholesale customers.
Download WordPress Plugin: wholesale-discounts-by-user-roles.zip for WooCommerce
Enjoy!