I feel like I need to get some professional boards for a personal project.
Whats the going rate these days for some pro boards for an independent project?

John, I guess that, like me, you're crap at drawing. Despite this, in 35 years I've never paid for a storyboard. I either use stick figures or words. Either way I explain that I'm not an artist but (in my case) a wordsmith hence the alternative.

Clients who think they aren't paying for a storyboard are either working with a talented artist (in which what's his programme making like?) or aren't living in the real world.