About a month ago I contacted Hotchkis about getting just a rear sway for my 07 tC. I had searched all over for just a rear by its self. After emailing the sales/ tech /... person I got a response saying that they were willing to sell me just a rear sway for a really good price(pm me for price). I just wanted to put in my two cents in saying they are a good company and willing to help out their customers.
I picked up my rear sway today from hotchkis and I am very happy.
Hope this helps some peolpe who just want to buy a front or rear sway bar, instead of buying the whole package.