Hi want to share something here for those who are very green and unfamiliar with business (like me). Here's what I learnt, the hard way, when trying to contact suppliers:
1. If your capital is small, and you are likely to make small orders when purchasing wholesale, a lot of suppliers will choose to ignore you cause you are simply not worth their time. Sad, harsh, but understandable...
2. If you email them using a generic email (i.e. hotmail, gmail) they will ignore you as they don't think you are a serious businessman. Your email may even get caught in their spam filter.
3. The biggest thing: Finding out the price you need to pay for wholesale products. Now to us laymen, if you want to sell a product, surely you must have a price for it. The prices are like holy grails to suppliers, they keep it very close to their chests and would never reveal their wholesale prices easily. Most suppliers would like proof that you are a genuine businessman before revealing their wholesale prices, such as business registration.
So here is the conundrum, you are trying to do a business research, trying to determine if a particular business is profitable and worth investing in. So you would like to know the cost of goods to estimate potential profits. But suppliers would generally ignore you unless you are a registered business with a business email address aka serious customer. It doesn't make much sense for a person to register a business, only to find after obtaining price quotations that he/she doesn't find the profit attractive enough to pursue the business. So you end up caught in a Catch-22 situation.
Solution? I'm not sure I have any.... How to avoid email being ignored? Perhaps phone calls to suppliers are harder to ignore.

Or save up till you have a large capital, then wave it in front of the faces of those suppliers to show that you are a potential big customer, then maybe they will be more cooperative.
For me, I'm going to give up trying to start a video games selling business for now. Perhaps I'll try looking into a business that requires lower capital, low value goods.... Or maybe services based business. Save up more money in the near future. So yea, a hard lesson I learnt which I want to share to those who are looking to enter into the business world. I wasted time, energy and also embarassed myself in the process of learning this lesson. But at least I didn't lose any money.