Trustpast is a paid membership and also a rating system. Look to see how many successful transactions the company has had. It will be listed under their name.
Before I made a deal for 100 items, I would talk to one of their reps and ask to buy just one sample and see how that goes. Also buy doing that you can check the quality of the item..
I would go to both sites, goscam and gospell and look under the contact info. You will see some phone numbers and email addys for the contact persons. Call in person if possible and talk with them telling them your intentions of doing business with them and your concerns..If you cannot call, then email and see what type of response you get from them..
There are alot of scam sellers listed on alibaba so you have to do your homework. I have used several sellers from the alibaba network but only used the ones that accepted paypal and sold me samples to check out first..
Buying 100 units with out getting at least one sample is a lot of money to risk without getting a sample order first...Also you want to know what type of shipping they offer and inquire as to tracking and delivery info..
Another thing you can do is to contact the main manufactor, (gospell) and ask for a list of their distributors as they may have some that accept paypal....