You write about 3 different colors to 100 different products. So I suppose that you need 3 different paragraph styles and not 100.
Create these 3 paragraph styles and create 3 entries in your TOC definition. Create also one entry style if you will that all 3 entries look the same, create 3 if you want them look different.
If you want to apply the same color of a paragraph to the TOC then you need only to create a character style for each color. Nothing should be specified except the character color in this style. Now you can use only 1 entry for these paragraphs because the character styles comes into the toc unchanged.
