Variation Add on Pricing

Hey guys,
I have a problem adding an “add on pricing” for product variation. I have a lot of attributes for each product and each adds a little fee. So it is almost impossible to manage all the prices for each combination of attributes. I was looking for a FREE plugin that you can set a price for each attribute and it adds up to the base price for the product.
For example:
Each product has over 3 attribute (Color, Size, Shape etc).
Some attributes have more than 10 options and each option adds different extra fee.

I want to set a price for each option of an attribute once and not for each combination.

I only found premium plugins that offer a solution but I can’t afford it. I hope there is an existing free plugin that can solve this problem.

Thanks in advance!