You can get Chinese visiting visa from Hong Kong. The price depends on the types of visa you're looking for (once vs multi-entries, 1-day pick up express service VS normal-speed visa arrangement). Many major hotels have a desk to help arranging visa going to China.
For more details, please see fmcoprc.gov.hk/eng/zgqz/blsjfy/.
Enjoy both Hong kong and China, and best of luck!
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