I have no idea why I never found this sooner: papercdcase.com.
Type in an artist and album name (or publisher and software name) and a track list, and this thing generates a PDF that you can print and fold into a paper case/envelope, complete with spine.I printed a couple at work for discs I use frequently. I think it would take about 10 to really master the folding technique.
This is much cheaper than buying plastic jewel cases, the result is more useful, and you’d still have to print and cut out inserts to put in that jewel to make it useful anyway.
I’ve made these myself manually, but it’s much easier to just type the information into a web form and have a computer do the formatting for me.