Fountain Pen Ink Cartridges - 10pk at Penn State Industries
Sheaffer Compact I Cartridge Pen (1960-64) - Black w/Steel Trim, C/C, Steel Extra Fine (Near Mint, Works Well) - Peyton Street Pens
Amazon.com: Schneider Ray Cartridge Rollerball Pen M (Medium), Refillable, Dark Blue/Light Gray Barrel, Royal Blue Erasable Ink Cartridge, Pack of 1 Pen (187803) : Office Products