Need WooCommerce extension for specialized bulk pricing.

TL;DR: I need a WooCommerce pricing extension that can calculate quantity discounts as multiples of the base price.

I am building a WooCommerce store for selling fonts. I sell font licenses on a per-user basis, just like software licenses. Different font styles are collected into font families. So Times Roman would be sold as:

  • regular font
  • bold font
  • italic font
  • bold italic font
  • family pack (all 4 fonts)

What I want to do is set up my fonts as variable products with attributes for styles. And then calculate discounts as multiples of the base price rather than percentage discounts. I do not want to create different fixed price tables for different base prices because that becomes a logistical nightmare. And I want to keep packages with higher prices in the same product as less expensive single fonts.

Pricing works like this:
Quantity, % Multiple, Real Cost
1 100 $40
2-3 200 $80
4-5 250 $100
6-7 300 $120

Is there a WooCommerce pricing extension that can do this?