I have tried every paper that has ever been referred to as paper piecing paper. I stick with lightweight vellum to tear out ( easiest to take out, no tiny bits) or Stable Stuff that is left in . Check wholesale online paper manufacturers for the vellum by the ream. One ream should last you for decades. Amazon has 50 sheet packs for about $7 by Darice.
https://www.rickytims.com/online-sto...-sheets-8-5x11