Patrick's and
Mothertrucker sell those gear sets. MT's price w/shipping is better. The sets are the same quality (probably from the same manufacturer in China/Taiwan?).
Most of the other vendors who sell the 3.55 R&P get them from Patrick's.
Here is one of many old discussions on this topic. I'd go with MT. If you go with Patrick's, try to haggle on the price - he is often flexible.
