honestly I've never sold or rented a dummy cake but I have read a few articles and forums where people discuss pricing dummy cakes. A lot of people charge nearly the same as a real cake, which surprises me, but in a way it makes sense because it's also quite a bit of work and the materials are not cheap. It's beneficial for me because im able to do it myself and I save a lot of the materials to continue to reuse but if youre making them for people I would do a google search before quoting them. I hope this helps.