WooCommerce Wholesale Pricing Pro Suite Plugin

Multi-Tier Role-Based Pricing
Gives you the ability to create multi-tier role-based pricing for for any use case you might have including wholesale Nulled, members, buyers clubs, etc. Create as many price roles as you need.
  Quantity Discounts and Cart Discounts
Offer quantity discounts across your entire line of products, or on specific product categories or specific products, or total cart quantity, and offer different quantity discounts to different wholesale buyers. You can also cart discounts based on cart contents totals.