Check out an Auto Recycler to buy the window regulator (I dont think they sell individual pieces like that just the entire assembly).

When my window got ko'd and my regulator was bent I ordered the part and saved a lot of moola (over the dealership that is). HOWEVER - make sure you're getting the correct part for your car and save your reciept as mistakes do happen (hence I didnt get to fix my window. . .hooray for saving money).

Welding could work too.