Don't waste your money. Onesource, which is the new version of world wide brands has mostly only dollar store type goods..In addition most of the suppliers that you will find on their site are also listed on this site.....
The reason you hear so much about them and also from a ebay admin is that they (Onesource-worldwidebrands) are owned and operated by several current and past upper management employees of ebay...This is the main reason that you see and hear that they are 'endorced' by ebay...Jim Grittith is the dean of ebay university and host of ebay radio and one of the owners of onesource, the other owner is a past upper management employee of ebay...They use this affiliation to promote the site....
I myself have a lifetime membership to onesource/world wide brands. I purchased it years back when they first started and it only cost about 29 bucks for a lifetime membership back then....It was a waste of money then and now certainly is not worth 300 bucks...
The only thing that has changed since I originally joined the site it that they have made it harder to navigate. As far as suppliers, there is really nothing that will help you......