1) If the sample is free? Yes, we provide A4 Free sample. 2) What certification do you have? Do not worry about the quality, We have ISO, FSC ETC certification. that will more popular in your local market. 3) Are you in GUANGZHOU? Yes, we are in guangzhou. and our warehouse is close to the port, that will increase the shipping cost for you. And if you are in guangzhou also, welcome to our company.