Thank you for helping us by reporting bad content.
Have you ever seen highlighter pencils? I have only seen the marker style highlighters, but these look pretty cool. Unlike standard fiber tip highlighters, these dry highlighters are eco friendly! They use no plastics, no ink solvents, and no volatile organic compounds, plus they will not bleed through thin pages. Set of 4 includes: pink highlighter, yellow highlighter, orange highlighter, green highlighter. It is only $7 for a 4 pack and I bet they will last a long time. You use a jumbo sharpener because they won`t fit in the standard size.
Image Source: http://www.stubbypencilstudio.com/product/GAPL_HIGHLIGHTERS4/Eco-Highlighters-4-pack/