Where can i buy helix/cartilage earrings?

I live in Dartford, England near London, i have my cartilage pierced, i can find loads online but i cant find any shops i can visit to buy them, a few people have told me Claire's stock them but apparently its not good to go there cause they tarnish... blah blah blah anywhere like Thurrock or Bluewater would be helpful and anywhere thats open on a sunday would be even more helpful! thank you :) x