A tombstone price depends on your choice of material, size, shape, and processing, sculpture, engraving, sandblasting, etc.
To get one set of the cheapest tombstone, you have to choose the cheapest material;
Secondly, the size should be controlled to be small with few components, such as only one headstone;
The other thing is to keep it simple.
For example, the size of a normal headstone is 55*45*6cm. The grey material price is almost $27, excluding the extra costs of packaging and transportation.