We had one that used to be called Lee Watson Reptile Swap that was in Streamwood, IL. Now I know that they were shut down a few times because people where selling "hot reptile". It's illegal to own in Illinois. It has since moved to Wheaton and is called Scott's All Animal Expo. They have reptiles, birds, dogs, small animals and now fish. They have it there twice a month. I have to say I went to the NRBC in Tinley Park, IL and I have to say I wasn't really impressed especially since it was 3x as much as the local expo. I pay $5 to get into Wheaton and it was $15 to get into the Tinley show and to me they didn't have nearly the selection as the other shows and their price where really high except for some of the supplies.
I hear Sewer Fest in WI is pretty good.