Set multiple possible sale prices on products that can be scheduled with an start and end date.
The new price can then be rendered using provided template and automatically updates shopping cart prices.
Install via composer:
composer require silvercommerce/sale-prices
Login to the admin and navigate to a product. There will now be a "Sale Prices" tab.
Queue up any relevent sale prices.
Next, replace the $NicePrice variable in your Product.ss and ProductSummary.ss templates (and any other relevent templates).