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$350 HK for a 4 working day one. I did this last week, Monday afternoon to Thursday noon. 2 entries is 100 more.
The agency I used is FBT, the standard price is $450, but you can print out a $100 discount coupon from their website and bring it along when you pick up the visa and pay.
I was in China for 60 days last year, for this reason they said a new visa may be refused, but in my case wasn't. It may be helpful if you have a second passport.