Office Depot and OfficeMax via Rakuten offers the Bic Ecolutions Medium Point Round Stic Ball Pen 50-Pack in Black for $3.99. Coupon code "OFFICE20" cuts that to $3.19. With free shipping, that's a buck under our mention from a week ago and the lowest price we could find by $1. They're made from 74% recycled plastic and feature a 1mm medium point.