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Amazon [amazon.com] has 8-Count Paper Mate InkJoy 300RT Retractable 1.0mm Ballpoint Pens (Medium Point, Assorted) on sale for $ 2. Shipping is free w/ Amazon Prime or on $ 25+.
Product Description from Store[LIST][*]Ultra-smooth ink in 8 Vivid shades keeps the fun and ideas flowing[*]Reliable and fluid 1.0mm medium tip draws bold lines from beginning to end[*]Retractable design is ready to write with just a click