This is Book Printing China, the price is good.
And quality of Book Printing China is pretty super than other countries.
Here is the specification of the Book Printing China,
Size: 150 x 150mm
Pages: 8 pages include the cover
Materials: PEVA outside, inside is sponge
Packing: usually by the polybag with the header card
Price: US$0.5~1.0 depend on your order quantity