That shape must be patented or copyright protected, because all the Amazon listings are several hundred dollars each. The usual knockoffs are conspicuous in their absence.
Indeed. The Wikipedia article says: "The gömböc, as the first physical example, is less sensitive; yet it has a shape tolerance of 10−3, that is 0.1 mm for a 10 cm size."
With a lunar lander you can play with the weight distribution. You can make it more dense on one side. This, together with a self-righting shape, could increase the chances of settling in the desired orientation.
While it was settling it would destroy all/most of the external fixtures including antennae, engine nozzles, and sensor housings. Bonus the rocking action during settling could puncture the hull or break a windows on a sharp boulder.
What if airbags inflated around the lander? The external shape of the lander-with-inflated-airbags and the internal weight distribution could make it self-righting, while shielding the external fixtures and the hull.
Just throwing ideas around and role-playing spacecraft designer.
Well, it's an example of a convex homogeneous body that does this. It's much easier if these are not requirements, just have a sphere with an off-center mass.