Amazon offers Prime members the Pentel EnerGel EnerGel Deluxe RTX Metal Tip Pen 6-Pack, model no. BL77BP6M, in assorted colors for $5 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $6.32.) That's $10 less than the lowest total price we could find for this quantity of any color purchased elsewhere. These pens feature quick-drying ink, 0.7mm tips, and latex-free grips.