Amazon.com : Dryden Designs Fountain Pen - Medium and Fine Nibs - Metallic Silver - Includes 24 Ink Cartridges - 12 Black and 12 Blue. : Office Products
Amazon.com : Schneider Fountain Pen Ink Cartridge, 3 boxes of 6 (18 Total Cartridges), Blue (36603) : Office Products
Black & Blue Ink Cartridges for Fountain Pens. Big Pack of 20 Short International Standard Size Cartridges. Perfect for Calligraphy Pen. Universal Fine Design with Incredible Long Lasting Color
Amazon.com : Pen Savings Fountain Pen Ink Cartridges - Pack of 24, International Standard Size, Length 1.5 Inch, 2.6mm Bore, Disposable & Generic, Perfect for Calligraphy Writing (Buttercup Yellow) : Office Products