This plugin is a premium version. You can download the free version at WordPress.org: Custom Price Labels for WooCommerce.

Custom Price Labels for WooCommerce plugin lets you add any price label to any WooCommerce product. Labels can be set globally for all products, or locally on per product basis.

Features

This plugin is a full version of the free Custom Price Labels for WooCommerce plugin, which has all options fields unlocked.

Free Version Pro Version
Override Global Price Labels with Per Product Labels yes yes
Search Bots yes yes
Visibility (Pages and User Roles) Options yes yes
All Products – Add before the price yes yes
All Products – Add after the price yes yes
All Products – Add between regular and sale prices no yes
All Products – Remove from price no yes
All Products – Replace in price no yes
Per Product – Instead of the price yes yes
Per Product – Before the price yes yes
Per Product – Between regular and sale prices no yes
Per Product – After the price no yes