I suppose it depends a lot on how you define a "normal breed". If more than one commercial hatchery offers them, I think most would agree that's a normal breed. I lot of hatcheries do Maran's, but most only cuckoo, so in my opinion BCM's are on the fence, and Blue CM's are certainly not normal. No hatcheries offer Rhodebars or Breese that I'm aware of, and Icelandics are only available from Sandhill (not sure if I count them as a commercial hatchery). Perhaps some hatchery has Cuckoo OEG's, I don't follow those very closely, but I suspect they aren't "normal" either. At least one commercial hatchery lists CCL's for sale, but everyone is with you on them. My point is just that there are non-normal chickens for sale on CL. The fact they are there on occasion, but not regularly, make yours likely to get at least some attention. I might be wrong, but I hope I'm right and when you post on CL, you get a lot of interest.
I wish we could do a poultry auction like the fish and garden clubs do auctions. I know there are livestock auctions, but they are a "last resort", IMO. A good auction is educational and not just a "dumping ground". The biosecurity implications make it too daunting to even think about.
DH:
There are a few meetups and swaps around SE PA every year(there is one woman in MD who has a big one)....last summer there was some talk of folks from here getting together around june for a weekend swap...they are not strictly chooks though...I also think there are many breeds of chooks that if you want to focus on a rare breed, they can be hard to get in driving range...I don't believe an of the marans are considered rare....here's a good list, but it isn't even complete.....http://www.albc-usa.org/documents/chickenbreedcomparison.pdf