TRD Toyota/Scion Parts Accessories from Sparks Toyota/Scion
Go to this dealer, and tell them what you want.
They will sell you the correct part.
It will be a genuine Toyota part.
And they will not rip you off for some inflated price like most local dealers do.
I think mine cost me about $125 plus a small charge for shipping.
Trust me, in the long run you are going to sleep easier at night knowing that the parts you used are going to be covered by your warrantee should anything go wrong.
There may be a cheaper place to get this part. Like the junk yard.
But I wanted only brand new Toyota parts in my brand new Corolla.
And remember, this ain't toilet paper you're buying here.
That switch will last the life of the car.