Oak Leaf via Groupon offers the UnityStar Fabric Marker 21-Piece Set for $15.99 plus $5.95 for shipping. That's $27 off list and the lowest price we could find. They're designed to work on fabric (such as cloth, canvas, and burlap), thick paper, plastic surfaces, wooden surfaces, and walls. and include a carrying bag.

Note: This item is final sale and is not fulfilled via Groupon.