I assume you talked to Stephen Gandy at Cameraquest. Just wait for him to get back to you. But if he
has already sold that 300G, there are some decent bargains out there on the 305 Apo Nikkors. They'll
be around a stop slower, but are probably going to be superior in several respects to any ordinary enlarging lenses. The formal specs for these are a bit misleading because they were composed with the printing industry in mind (copy cameras) and not enlarger use.