Net-a-porter and Matches sell them. www.net-a-porter.com and www.matchesfashion.com. I buy from both of these websites quite often and usually get delivery within 2 days. HTH.
Oh they're coming back in a big way. I assume you mean bejewelled cuffs, that attach through a piercing then have embellishments that go up the ear and not the old 80's thick silver band type that just clips to the top of the ear.
Swarovski have some - I have a small pair from them. Most jewellers are carrying them now.