Amazon offers the Expo Low-Odor Dry Erase Markers 12-Count, model no. 86603, for $5.01. Order via Subscribe & Save to receive free shipping. That's the lowest total price we could find by $7. They feature chisel tips and quick-drying ink.

Be sure to cancel Subscribe & Save after your order ships to avoid being billed for subsequent shipments.

Update: The price has dropped to $4.53 after the Subscribe & Save discount.