silvercommerce/discounts

1575 Module that adds discounts (either as a code, or on a group) to SilverCommerce

plato-creative/platoecommerce-bulk-discounts

Version dev-master 11 Bulk discounts support

sunnysideup/ecommerce_complex_pricing

Version dev-master 11 add pricing rules to your silverstripe e-commerce (e.g. discount per group or per country)