I've been to two private gynaes in HK. Dr Eric Lee in Prince's Bld, Central - Hk$700 consultation, HK$300 ultrasound. I liked him because he's very patient and doesn't rush you out of there.

On the recommendation of a Chinese friend, I visited Dr Ivo Chen in Tseung Kwan O (since I live there). Around HK$560 for visit, including consultation, ultrasound, urine and bloodprssure check up beforehand and antibiotics.