Hi Eric,
Ask that ebayer, he certainly has what you are looking for.
Here is the direct link of the product seller.
http://cgi.ebay.fr/EASTMAN-KODAK-16mm-x122m-400ft-DOUBLE-X-N-B-Black-White-Negative-7222-/230779257825?pt=FR_JG_Photo_Camescopes_Cameras&hash=item35bb8403e1
Goof luck