Now I'm not expert on this matter, but after talking to three one my friends (one doctor, one nurse, and one biology professor) I have learned that the human body can only process so much protein. Each time you eat protein, you can only process around 30g(give or take, depending on the person). Anything over that just gets excreted with your urine.
From what I have read, for someone who regularly lifts, you should be getting 1.0-1.2 grams of protein for each kilogram you weigh. Since 1kg=2.2lbs, you should be getting 75-90g of protein per day. Now obviously is depends a little bit from one person to another, but this is a good general rule. I would say you can take it down to the low 100's and be getting all the protein you need, and then some, and save yourself some money in the process.
EDIT: After doing some online research, I found that almost every website reccomends between 80 and 100 grams for someone of your weight who does regular weight training. There were a couple sites that said as high as 132 for you, but that was by far the highest.