the last time I was in Newtonville Camera (in Newton on Walnut St.), I think there was still a packet of brochures on a rental darkroom in Boston. They were back with the darkroom stuff, if that's what they were. You could try the Harvard extension school, Museum of Fine Art, and the Danforth Museum in Framingham to see if they have them or know of them. The Danforth does have a darkroom, but I don't know about renting it.