Sister, please do not try to enter business with Chinese companies long distance like this. I haven't seen a single person who did this and didn't regret it. Do not be impressed with websites or pictures online, chinese manufacturers and trading companies work on very loose laws of quality that you will almost certainly be disappointed. Most companies that manufacture there successfully fly there and negotiate specific engineering standards that they know and commit the producers in solid contracts. This $100 though a small amount to risk, is a high amount for a sample, I agree, but it depends on what you're ordering. If it's fabrics or simple products, you should get it for free. I got mobile phone samples for less than a $100.
Second, There are those who charge payment for sample and send nothing but worthless junk that had nothing to do with what they advertised. Don't like it? Tough, there is no authority or person to object to efficiently when dealing with Chinese. For every real company there are 8 or 9 loading on just junk and doing business on well-meaning buyers and sample orders. It is annoying because you're waiting for something to work with and it really blows your enthusiasm out of the water when you get trash. You feel stupid and your money and time wasted and think you can't make it in business if this is what's out there.
Third, alibaba.com is fraud central station, what caution you use outside needs to be 10 times multiple for any contact coming from inside that website. The authentication that Alibaba does is nothing more than address and real office or not.
What one of my close successful friends here in Malaysia did and advises that I do, was research the market over an established product similar to what he wanted, scoured around to find who traded it successfully out of china, contacted them for what he wanted (reliable company that already has a product present) and after doing several business deals and generating profits, he used the money he made to fly to Hong Kong, and dig through them to a reliable manufacturer in china to make what he wanted, later on to establish a direct connection to a reliable chinese manufacturer. He told me finding the decent manufacturer like that is not easy, and for a foreigner they will most certainly take you for a big ride. Please note that he is Malaysian of a chinese origin, so he has the advantage of language and race to help.
Good luck