Egg drop egg that is reusable?

Ok weird question and please delete if not the right place. My son (4.5yo) has started building things and dropping them and I thought it would be fun to start recording it in slo mo and observing how the thing breaks. He’s seen videos of egg drop tests and wanted to try it but I don’t want to use up a whole bunch of eggs for this (hubs has recently started trying to only get pasture raised and they expensive).

Looking for inspiration on an “egg” that we can either make or something for this. Thoughts? Amazon products?