I fixed it. But in a way that doesn't really address the issue.

I have two sites with the same products, a retail and a wholesale. The wholesale one is the one having the issue.

So I cloned the retail site and uploaded parts of the database I needed from the wholesale's original db (admin info, customer info, product info, coupons, etc). And now everything is working.

This method was actually a hell of a lot faster of a solve. I spent over 10 hours trying to fix the issue and only 2.5 hours to clone the retail site and upload parts of the wholesale db.

In this case, I would suggest you make frequent backups of your site. Esp before you install any new modules. And when you find a problem you can't solve that wasn't an issue before, start working backward in your backups to a place when the issue wasn't there. And maybe that'll help identify the module that could have caused the break.

Hopefully this helps someone.