The left shifter? For the front derailleur?
How soon do you need it?
I have an old set of R700s that the right one broke. I was going to rebuild it myself but never got around to it. The left (front) shifter is perfectly fine, but I could only replace them as a set. The catch is, it's in another state and it'll probably be the fall before I can get it.
If you're considering not doing the upgrade until the fall ... if you could wait until the fall for a new shifter ... I could make you a smokin' deal.