My favorite tracing paper lives at Staples in the "Drafting Dept." It comes in white and yellow and available on rolls 12" wide or 18" wide.
This is the price of the 12" size and 50 yards will last quite a while. The paper is crisp and falls away after stitched. I use it to trace patterns, for quilting, and for appliques. It would be awesome for paper piecing. The best part is I can pick it up after getting groceries next door.