Save your money.

The CRJ is not a difficult aircraft from a systems perspective, as long as you understand transport category systems. If not, you can buy a book off Amazon for $20 that'll give you the basics, and any half-ass airline ground school instructor can fill in the specific blanks.

I'll tutor you on CRJ systems to your heart's content for $50/hr; after 10-15 hours you'll be able to pass any 121 systems oral and you'll have saved a boatload of cash, even compared to the PanAm course.