So far, Parson got Paper 3D-goggles (cheap), the battle-calculator is just a hard plastic sleeve acting as an interfact to his calculator-clock, a toy sword hilt, and now the ricasso.
Ok, there was no statement about the material of the sword, but from the continuing "toy" aspect, I would not expect it to be a made of real steel.
The value of those items to erfworlders is completely unrelated to their manufacturing cost / value in our world.
Same as the value of a piece of paper can vary wildly, depending on what is written on it, and to whom