Hi vacationgirl,
I usually go to Hong Kong 2-3 times per year. Mac's are shunned more in Hong Kong and China than they are in the US. There are a few authorized Mac resellers, but the prices aren't significantly different. Also, iPods are a lot less common there too.... you rarely see a commuter using one. It's always some other brand of MP3 player.
The easiest place to see iPods are in the touristy areas of Tsim Sha Shui (on the Kowloon side of Hong Kong). These are the electronic vendors that have glass storefronts with a lot of electronics in the windows. There won't be much of a deal, if any, since they are catering to tourists (who have more money).
Here's a list of Mac re-sellers if you're looking for an iPod. Keep in mind that you should ask if you are covered by a warranty when you get home. Also make sure if your adaptor is compatible with your voltage at home (if the iPod comes with one). I've never been to any of the re-sellers on this list except for Broadway. This is a well-known, reputable chain. I don't think you can haggle with them:
http://www.appleclub.com.hk/buy/reseller.html
According to another website... "Apple Computer shops have been in decline in Hongkong lately but there are some good vendors on the 12th floor at Windsor House like the briskly run Designer Group Company Apple Centre where staff speak decent English. They have a new outlet in IFC." Both of those places are on the Hong Kong island side of Hong Kong. The IFC is the tallest building in the skyline. To get to the Windsor House, take the MTR subway to Causeway Bay station and then take the E exit at that station and go to floors 10-12 of the Windsor House.
For the ultimate fun, go to the Golden Computer Centre. Avoid going there on weekends. It is literally packed with people. So pick pocketing can easily happen. Most of these shops are 8' x 5' but there are tons of them. Again, not much Mac stuff there. But you might find a good deal on generic RAM there. The ground floor is mainly videogames (a great place for that too!) and the basement level is all computer stuff. This centre is opens late and stays open late. If you want to see all the shops open, go there after 2pm. They typically stay open until 8pm or later. Most places there won't take credit cards. This place would be closed down by the fire department in the US due to the large number of shops and people and small amount of space. If you're planning to spend any significant time there, there's no bathroom, but a nearby McDonald's has one. To get to the Golden Computer Center, take the MTR subway to Sham Shui Po, take Exit D2. It's directly across the street from that exit. Here's some more info and a picture of the place:
http://www.12hk.com/GoldenShoppingArcade.html
PM me if you need any other help or tips for toy shopping in Hong Kong.