Replacing day-shades with night-shades

[N-Trouble]

My new 5er has day shades on the windows in the front bedroom that I would like to replace with night shades. Is there any place online that sells these in the same size that I would be able to easily swap out?

[cpaulsen]

I am replacing my day/night shades with the cellular shades at Lowes by Levelor. Much simpler to use. They come in stock sizes at the stores and most can be cut down on their machine. We needed some 18" ones and they had 24" which were able to be cut down 3" on each side. Or....you can order custom sizes. And my stock ones were very inexpensive.