June Tailor, Linda Hahn, Sharon Schamber and Ricky Timms all sell PP foundation sheets that can be run through a printer, then don't have to be removed once the blocks are finished. The June Tailor can be found at JAF and WalMart, and Linda Hahn sells it on her website. Sharon Schamber and Ricky Timms sell them on their websites, and you can also buy it in yardage, as well as in sheets. I use these, because I can see the lines clearly on both sides and they don't have be removed.