Platinum Preppy is the world's best cheap fountain pen. For under $5, Preppy packs a punch with its surprisingly smooth and consistent nibs. Unlike other pens at this price range, it's refillable with Platinum cartridges. Available in Extra Fine (0.2 mm), Fine (0.3 mm), and Medium (0.5 mm) nib sizes. If you aren't sure, Fine is the most popular size, and more colors are available in Fine than other sizes. Made in Japan.