Here is my advice...Speaking from experience...
Go here..
www.lateral-g.org/artwork/
Click on the links to the artists websites...From there..Most of them have contact information available...
For example.. Ben Hermance has a "contact" button on his home page with his location and email address..
www.hermancedesign.com Send your request for quote on the
specific project you want done. And ask for a quote.
The others have the same..
Otherwise, look up their user ids here, and send a PM...