I have this feeling that Blue Moon is the only place doing good optical proofs. Most others are old one-hour labs that couldn't be bothered to update their equipment. Most of the time, this also means they can't be bothered to keep the lenses clean, resulting in a print that is worse than a scan.
That being said, the lab I use, Philadelphia Photographics, does offer an optical contact sheet from all B&W and C-41 orders, if you ask for it. I have never tried this service, but their optical enlargements are excellent, so I wouldn't expect anything less for their contact sheets.