The price is based on the standard Spec:

1.Board tickness: 2-6Layers〈=1.6mm, 8-10Lalyers〈=2.5mm

2.Copper thickness: 0.5～1 oz

3.No blind vias, no Buried vias

4.Minimum hole diameters is 0.25mm

5.Minimum track width and space width 5 mils

6.Surface finish is HAL(non lead free)