If your friends want to buy a camera, tell them to go to Flatbush Ave in New York City. The camera shops there have the cheapest prices in the world.
If that isn't a viable option, then have them order from Amazon.com and delivered usually free of charge to a USA address. Beats Fortress hands down.
When I order from Amazon, I have all my orders delivered to my hotel to beat the delivery charge to HK. The returns policy is better than anything in HK.