There is no need for a wordpress plugin go to clickbank and login then move to account settings tab there click on my hop builder and use text ads to build your ad block that will display ads on your website based on the keyword that you have used.
Wodbankads are the worst to use on a wp blog. The above information on clickbank is your very best bet! They have various sizes, you can change colors to suit your blog, and very simple to add to your blog. Plus each visitor will see (most times anyways) a different line up of products.