Add Banners to 9 Wordpress Sites

I have about 9 wordpress sites I would like them modified to add banners. I think each site maybe have one or two banners. I don't need the banners designed, I will provide the banners. I just need them added to the site. They will be standard size banners. I would like them added to the sites so that they are in different placements on each site or look different so it doesn't look like the same designer worked on all the sites, so their placements should be unique. Must have experience with wordpress, html and probably php and some web design background. Let me know how much time this would take and the cost. Thanks