uni-ball KuruToga Mechanical Pencil, 0.5mm, HB #2, 1 Count – Link

Amazon has this currently marked down to only $2.98.

Note that this is an Add-n item which ships with a $25 Amazon order.

• State-of-the-art engineering provides a precise, smooth writing experience
• Rotating lead mechanism keeps pencil sharpened and helps prevent breakage
• Exclusive diamond-infused #2 lead creates dark, crisp lines
• Replaceable eraser cleans up mistakes
• Includes: a 0.5mm mechanical pencil, 12 #2 lead refills and 2 extra erasers