Here's a list of Fox News Sponsors to boycott until support for dishonest "news" (propaganda disguised as news) is no more. Write/email letters to these and local sponsors letting them know of your disinclination to buy from them while the shows they sponsor continue dishonest practices.
As a possible example, you could copy and paste the following into the email message after clicking on the particular sponsor link below:
This message is to let you know that until Fox News discontinues unfair practices of blurring partisan political opinion with news and calling it "Fair And Balanced", I will avoid buying products from sponsors of its shows. I have noticed your products advertised on this network. Please let me know if your company plans to continue this controversial support of this unethical practice through advertisements on this network or if I could consider to purchase your products again.
Sincerely,