Save a fortune! Sew your own washable feminine hygiene pads. Use old trifold diapers for inside layers, add layer of waterproof under the outer layer from old baby waterproof pads, and use flannel for outside like the expensive ones you order. Finish with a snap on wings or a button/buttonhole.
UPDATE: Everyone has been repinning, so I thought an extra note is necessary. I added to this, I added natural cotton quilt batting inside of the pad area, I have a heavy flow some weeks and it was VERY needed. Happy sewing!