Hey Hive account@mr-bike! Thank you for the interest. I hadn't finished this when I posted this blog post, but you can see a greater selection of services and their prices here:
https://discordapp.com/channels/408650263159635968/439177887656968193

Specifically to answer your question though, assuming a "banner" is something you would place within a post (sorry if not what you meant), I would say prices depend heavily upon complexity of the image to be created. Probably looking at 3-5 for a banner, and 1-2 for a breaker. Give or take.