I have Adblock Plus on my desktop computer, which I am using with Chrome. I think it's a Chrome add-on. I use a different one for my iPad; I can look up the name of it later, if you want it.
All the ad blockers I have used have been free. The iPad one is a free download from the App store. For my computer, I think I Google Adblock Plus and found out how to add it to my Chrome browser that way. Which ad blocker you use depends on what type of computer device you are using and what kind of browder you are using to access the website. Googling will usually tell you what to check out.