I tired the "Kabnet Wax" and it will not go through my inkjet printer but it's my choice for foundation piecing. I won't use vellum for foundation piecing, only paper piecing. I use to think buying vellum was a waste of money when there were cheaper things to use. I got over that with my first vellum use.
To find recycled newsprint at office supply stores, look for children's drawing pads. The brand I like is called Scribbles and it comes two pads to a package at Staples. I have to trim off 1/2" for it to fit my printer but it prints fine and is very easy to tear away but also very easy to rip before you are finished sewing on it and doesn't pull away clean like the vellum.