Exist a product discount in Drupal Commerce I'm using Drupal commerce kickstart. I installed Commerce sale price to manage the discounts for specific products. This is a great module, the only bad thing is that this module  actually creates another price to link to products. So if I use the filter price, this one will filter either regular price or sale price, but never both together.

I know that I can create discounts with rules, but I would like to find something simple,  that can be set up easily when the customer creates a product.

How would you fix this issue ?

Thanks
If the goal is: "the site administrator can create simple discounts for products".
You can add another field like "discount percentage" . By default would be set as 100 % (or 0% of discount).
Then, with rules, you check if this fields have another value than 100, and recalculates the price.