Because there are a great many covers on this site, it might be easier to looks at a more specific section. Click on links below:
New Covers are $100 for the first, $70 for the second, $50 for the third. (Older covers are $75 for the first, $50 for the second, $40 for the third or lower) Change of title/author included, some limited revision possible (font change, text color change), but larger changes will require extra payment. (See pricing page.)
To see groups as a slide show, click on any image.