I believe Berwyn Hobbies on Ogden Avenue stocks the BCR & BCR-2. I'm pretty sure I bought a BCR from them several years back to put into an old MTH PS1 engine that I run only at Christmas time. BUT, call them before you go to confirm. Chicagoland Hobbies on Northwest Highway might have them as well.
Don't think I've ever seen any of GRJ's products stocked in Chicago, but I could be wrong and often am.