[IHTIO]

Sorry, I can't provide a list of store. But I can assure you that they are everywhere. In a 10 minute walk on Nathan Road in Mong Kong from Sino Center to Pioneer Center you will find at least 3 Ball AD, one on Sino Center, one on Pioneer Center, and one in between. Remember to ask for discount. The official discount policy for Ball Hong Kong is a maximum of 25% off the list price. In fact, most store will give you a 25% off right away so you may consider the street price to be 25% off the sticker price. Some small shop like those in Mong Kong ignore the official policy and give you a discount between 30%-40%. I checked out an Engineer II Arabic and an Engineer Master II Chronometer in the Sino Center store a few day ago and the price they quote was more then 30% off listed.
I have lived in Philly for a year, shopping in Hong Kong is a lot more convenient then shopping in Philly since the shops are so densely packed in the urban area. However remember to check the watch carefully before you pay because most stores do not have a return policy.