Buying book nook walls only?

Hi all,

I have basically run out of the best of the best book nooks and want to start making my own. The only problem is that I don't have a laser cutter to make the outer casing, and I don't want to go to the effort to make a clunky, overengineered box that I know is going to be bigger than what someone can just laser cut. The question is, is there anywhere you can buy a pre-laser-cut kit for just the outer walls that I can cut and paint however I like?