I read your post and I may be able to help. I'm a Canadian currently working in China so I'm familiar with what you can and get in China.
As for original mobile phones and iphones, you won't be able to find them for cheap in China. For mass memory like Memory Stick Duos and USB keys, they are quite cheap here to purchase. Some are labeled as Sony etc etc but I'm not sure if they are originals or just relabeled but they all work how they are supposed to.
I do know more about clothing because that is what I mainly export for my clients. If you are looking for branded clothing, there is everything from Hugo Boss to Abrecrombie to Ed Hardy etc. Most are not originals but if you look hard enough you can find alot of good quality copies of the originals (not just T-shirts with Armani written on it 100 times).
For designer bags, they are also copies. They have grades that go from B to A to AAA and in some cases 1to1 (supposed to be same material and everything as the real deal). I've looked at some AAA and compared them with the originals and I honestly can't tell the difference.
So I guess alot of what you are looking for is fake in China. But obviously there is a large market for fake goods, and if you inform the customers of their authenticity and your price is fair then it may work.
Another route is if you want to start your own clothing or purse brand. There are ALOT of clothing and purse companies with their own styles and designers that can make you quality fashionable clothing at great prices. You can also put your own label on them.
If you need anymore info or help sourcing these products. You can PM me or email me at firstname.lastname@example.org