Submersible fountain and light for garden water feature

Hong Kong has a rich diversity of shops but the frustration comes when you are looking for some very specific item. I visited over forty shops in the Flower Market, Goldfish street and Fa yeun street trying to find a submersible pump and attached light for an outdoor water feature. The current one, made in China of course, has broken. I took the pump with me and showed it to many, many shopkeepers. "No this one", "Not here" "Any idea where there may be a shop that sells these?" "No", "No", and so it went on. During the course of the two days spent trying to source this item I discovered an amazing range of shops selling just one item but in infinite variety. So the question is: where is the garden fountain supply shop in Hong Kong. BTW searched on Google, Bing and Yahoo and Baidu: all came up with alibab and ebay. I need a real shop where I can see before I buy!!