It's boxed as two separate 5 disc packages: one 4k and the other regular blu-ray.
I was just going to buy the first film in 4k, but for $9 more I got all the rest, plus an extra set on regular blu-ray to give away.
How does this work? A 5 disc set with 5 films: how do they get both the 4k and regular blue ray smashed into 5 discs?
I just looked - price expires in about 5 hours!