Notarization requires a notary office. There are local notary offices in cities above the prefecture level in Liaoning. You can search through the local government window or other convenient service platforms. The cost is inevitable. A simple notarization is probably 100-200 yuan. If you need them to translate, you have to pay more. That's it. People are monopolized. They usually get it done in 2-3 days. Please consult the materials you need to bring in advance.
I wish you good luck going abroad and a little success!