Here are the prices for China Visa in Hong Kong
Source:
http://www.fmcoprc.gov.hk/eng/zgqz/blsjfy/
Individual Visa
Single visa
HK$150
Double visa
HK$220
Multiple (6 months)
HK$400
Multiple (12/24/36 months)
HK$600
Visa Transference
HK$100
Additional Charge for Expedited Service (Individual Visa)
Express Service
HK$150 /person
Rush Service
HK$250 /person
NOTE: No additional charge for expedited service for accompanying children included in the same passport
Processing time of application
1. Regular service: 4 working days including submission day (e.g. Submission on Monday and collection on Thursday)
2. Express service: 3working days including submission day (e.g. Submission on Monday and collection on Wednesday
3. Rush service: 2 working day (including the submission day. e.g. If visa application is submitted on the morning of Monday, collection time is on the morning of Tuesday; If visa application is submitted on the afternoon of Monday, collection time is on the afternoon of Tuesday)