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[serendipity17]

I found reusable refillable white board markers. They sell you a 6 or 12-pack of pens for $5/pen. Yikes, right? Nope! Here's why: they ALSO sell bottles of ink (=40 pens) plus new nibs. If you can keep track of your pen-bodies, you need never ever buy new ones.

http://www.ecosmartworld.com/order-auspen

Australian engineers = brilliant.