Two, looking for PCB mass production plant sampling, if the subsequent production of large quantities, can be negotiated for free or return the sample fee when the volume of production;
If only sampling, are generally charged, unless your other volume production is very large may be part of the sample does not charge.
The cost of samples is related to the type and quantity of samples and the length of the delivery period.
Conventionally, single-sided panels are cheaper, double-sided panels are more expensive, and multi-layer is the most expensive;
From the process, OSP is cheaper, and tin spray and gold plate are more expensive.
From the type, PCB is cheaper, HDI is more expensive, FPC is more expensive, hard and soft to the most expensive.
From the material, cardboard is cheaper, CEM is a little more expensive, FR4 is more expensive, and if it is aluminum-based or copper-based, it is more expensive.