Check out some of the vendors people have experience with. Personally, I would go either with Shenzhen Luyuan or Docan Power. Both of those have representatives that are active on this site, and you can review comments others have made purchasing from them. Getting the ells through Alibaba after having a chat with the vendors in question for a personalized quote is the way to go - make sure you specify DDP shipping terms, and you can sometimes get a small discount for mentioning that you found them through this forum.