Fisher Space Pen Writes Upside Down Ballpoint Retractable Pen, Black (ECL) : Office Products - Amazon.com
Paper Mate - Retractable Ball Point Pen: 1 mm Tip, Red Ink - 19349273 - MSC Industrial Supply
Folded Ruling Pen - John Neal Books
Mini Portable Scissors Knife Paper Knife | Mini Folding Scissor Pen Cutter - Mini - Aliexpress
Amazon.com : 2 Pack - Retractable Pen Reel for Thick Markers & Carpenter Pencils - Carabiner Clip for Apron, Belt Loop or Bag Strap - Great Gift for Baristas, by Reel-N-Rite (Black) :
A folding ballpoint pen that fits in your wallet - The Gadgeteer