cheapest way to remove ink from clothes?

Rubbing alcohol. Put a folded paper towel under the stain and dab the alcohol on from the back with a cotton ball, so the ink pushes out onto the towel. Keep moving to a clean bit of towel. Then a drop of dish soap, rinse, and wash as normal. Hand sanitiser works in a pinch, it's mostly alcohol. Don't put it in the dryer until it's completely gone.