I found a non-woven foundation for paper piecing made by June Tailor that you don't have to remove. It goes through both my lazer and ink jet printers just fine. I will remove the outside 1/4" seam allowance around each block to reduce the bulk when I sew the blocks together, but I don't remove the inner sections.
It comes 25 sheets to a package, and I originally found it at Walmart, but JoAnn's carries it too, so if I have a 40% or 50% coupon and don't really need anything else, I pick up a package.