I purchased a few NUC boxes this fall from Rossman Apiaries and wow, what quality. I found that other local suppliers didn't provide inside or metal for the telescoping covers and in my part of the world, with the significant amount of rain we get, I think metal covers are essential. I also thought I would give the cypress NUC's a try.
Just thought I would share a positive experience.
Fred Rossman is a great guy to work with. I value his flexibilty and service!
If you have not tried Rossman's inner covers, or their Ross Round supers, you are in for a treat.