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I really like how The Writing Desk shows the cost of ink for sale per ml. Perhaps this is in part to push the sale of their own rebottled Diamine ink at a lower cost, but it helps me see the overall cost vs volume. Looking at the Goulet Pens website, here are the current costs per milliliter of bottled ink for the most common and available brands in the US: Aurora - 45ml, $15.00, $.33 per ml DeAtramentis - 35ml, $12.50, $.36 per ml Delta - 30ml, , $15.00, $.50 per ml Diamine - 80ml, $12.75, $.16 per ml - 30ml Registrars, $15.50, $.52 per ml - 100ml Registrars, $29.75, $.30 per ml - 30ml Flowers & Music 10 bottle sets, $89.00, $.30 per ml J. Herbin - 30ml, $9.75, $.33 per ml - 100ml, $20.00, $.20 per ml - 50ml 1670 inks, $24.00, $.48 per ml - 10ml Scented Ink Sampler 5 pack, $21.00, $.42 per ml Lamy - 50ml, $10.50, $.21 per ml Montegrappa - 42ml, $20.00, $.48 per ml Monteverde - 90ml, $12.50, $.14 per ml Noodler's - 1oz (29.6ml), $13.50, $.46 per ml - 3oz (88.7ml), $12.50, $.14 per ml - 3oz (88.7ml) Blue Ghost, $13.50, $.15 per ml - 3oz (88.7ml) Polar Blue, $16.00, $.18 per ml - 3oz (88.7ml) Eternals, $18.50, $.21 per ml - 4.5oz (133.1ml) Bulletproofs, etc., $18.00, $.14 per ml - 4.5oz (133.1ml), Waterase, X-Feather, etc., $19.00, $.14 per ml - 4.5oz (133.1ml) Baystate/Cape, etc., $21.00, $.16 per ml - 4.5oz (133.1ml), Polar Blue, $24.00, $.18 per ml - 4.5oz (133.1ml), Kung Te-Cheng/Sepia, $27.50, $.21 per ml Omas - 62ml, $15.50, $.25 per ml Parker - 2oz (59.1ml), $10.30, $.17 per ml Pelikan - 62.5ml, $11.00, $.18 per ml - 30ml Highlighter, $16.50, $.55 per ml - 50ml Edelstein, $25.00, $.50 per ml - 50ml Edelstein Turmaline, $26.00, $.52 per ml Pilot/Namiki - 60ml, $12.00, $.20 per ml - 50ml Iroshizuku, $28.00, $.56 per ml Platinum - 30ml, $7.00, $.23 per ml - 60ml Mix Free/Pigminted, $20.00, $.33 per ml Private Reserve - 50ml, $8.80, $.18 per ml Rohrer & Klingner - 50ml, $12.00, $.24 per ml Sheaffer - 50ml, $9.00, $.18 per ml Stipula - 70ml, $19.00, $.27 per ml Waterman - 50ml, $10.40, $.21 per ml Most affordable ink by ml: Monteverde & Noodler's - $.14 per ml Most expensive ink by ml: Pilot Iroshizuku - $.56 per ml