Pretty much every tackle store has them I get mine at hogans in dana point. They have the braid safe ones. Otherwise the braid will eventually chew through the other ones.
These are the exact ones I use and I love them.
http://www.cabelas.com/catalog/produ...type%3Dproduct
I basically rig them up just like a Carolina rig, or you can use a swivel and it acts just like a 3 way but with less tangles. Or take the clip off and then it basically works exactly the same as the tubing trick.