Auspen Brand Refillable Dry Erase Markers
Math: 6 (endlessly refillable) Pens x 6 Bottles of Ink = (conservatively) the equivalent of 114 disposable dry erase pens
Each bottle of ink will refill a pen 18 times (25 drops per refill)
From the Auspen website: "Most people think ‘disposable = cheap’ – what we found is that it’s the other way around. Disposable costs more and its a terrible cost on the environment." We couldn't agree more.