When I first printed this, the top and bottom faces didn't print correctly. To fix this, I increased the top and bottom wall thicknesses to 1. I also had to create supports on the face with the spiral on it due to overhang.
The cost of this print is roughly $1.12. The one I printed is 56g, for reference. I was not able to find a commercial equivalent, but if there is one similar to this, my cube will still likely be the more affordable option.