Personally, I wouldn't spend the money they are asking now. I am an original member from when they first started up, and the lifetime membership was passed at no additional cost when they switched over. I only paid a few bucks to join back then. It was around 29 or 30 dollars. It was Called worldwide brands back then. It recently switched to 'OneSource'. They added a few bells and whitsles, but not really much changed as far as the sources..If anything they made it a bit harder to navigate..
Two of the owners of the site are Ebay upper echlon employees, or were at one time, not sure if they both still are or not. But this is one reason why they make the claim to be the only sourcing site actually endorced by ebay..I personally think it kind of a conflict of interest.
As far as the listings, you can pretty much find better ones on this site, and if you can't all you have to do is ask and someone probably has a better one and will be glad to help you out..
OneSource does claim 'light bulk' sales sources, but from the ones I've seen they mostly offer flea market type stuff, I have not really found any good suppliers for decent products on that site..
As last I heard, the price was something like $167 dollars. That's way to high for what they are offering..In my honest opinion, keeping in mind that I have a lifetime membership there, I would not spend the money if I were joining today.
This site has much better resources and excellent forum support at a fraction of the cost...