First:
Welcome to the forums!
Are you looking for
- an edited cover or self-drawn?
- free or paid?
I also recommend to visit and check out List Of Open Art Shops!
These are almost all open art shops. You are going to have an easier time to go through them rather than scrolling for hours to find one 
You can either answer in the art shops or pm the artist. Just keep in mind to read the rules of the specific shop before requesting/commissioning 