i was wondering if the addresses you provided:
Try Mongkok area.
Starting from Wing Shing just outside MTR station. The whole stretch nearby are full of shops selling camera gears.
Shop Location 1: 55-57 Sai Yeung St., Mong Kok, Kowloon, Hong Kong. (Original store)
MTR: Mong Kok station - exit D3 - 25m ahead over the road.
Shop Location 2: 91-95 Fa Yuen Street, Mong Kok, Kowloon, Hong Kong. (New store)
MTR: Mong Kok station - exit D3 - 2 blocks away from location 1 above on "sneaker street".
Other reputable stores include Fortress, Citicall. They all have quite a few stores in HK.
Another reputable shop is Tin Cheung in Tsim Sha Tsui:
Location: Shop 5 Friends' House, 6B Carnarvon Road, Tsim Sha Tsui, Kowloon, Hong Kong.
MTR: Tsim Sha Tsui station - exit D2 - over the road next to the 7-eleven.
580EXII is selling around HK$3,300 with international warranty. Compare to S$720, you should be able to save around S$140 on the flash...
Am i able to purchases a Holga and the 35mm adapter there?