I have started renting space on the side bar of my blog for book cover ads at $20 per month per book. I also link the cover to the book on Amazon, which will raise your rating. Some of the authors have reported increased sales activity immediately after having their covers added.
I uploaded them in the order I received them. As long as the author pays the monthly fee, that reader will keep that spot. When a person decides not to renew, I'll delete the cover and everyone will move up a slot. If a person wants to maintain that slot over time, I will switch out the cover for them at the beginning of any month to another book cover.
I do not use PapPal. I had trouble with it and don't want to deal with it again. So I will accept checks or money orders.
Mail them to:
Lena Nelson Dooley
PO Box 54614
Hurst, TX 76054
Be sure to email me with any questions. And email me about posting a book-cover ad on my blog.