The webdna Commerce Bulk Pricing plugin allows users to set quantity discounts for bulk orders or specific user discounts on their ecommerce site.
Simply create a Bulk Prices fieldtype, add your column headers (e.g. 25+, 50+ 100+) and set the required quantity a customer must purchase to receive that price.
Alternatively, there are additional options to restrict the prices to certain user groups and to specify if the prices set to include tax.
To install this plugin, copy the command above to your terminal.