Everybody Coffins produces coffins that are easy to assemble without tools, IKEA-style, and ship flat easily. They’ve built them for emergencies, but I think they will probably see another big market from people who want economical coffins, unlike those gilt mahogany extravaganzas that funeral homes try to push upon the bereaved.
Don’t think the lower-middle class is being denied the benefits of economic growth.
If you prefer a more modern look, here are coffins designed to look like sleek cocoon-like pods, made out of soy and jute. They decompose in fifteen years.