Amazon has the 12-Pack uni-ball Vision Elite BLX Infusion Rollerball Pen (Black Ink Infused with Blue) for $9.39 - 5% off with Subscribe & Save (can cancel at any time) = $8.92 with free shipping on $35+ or with Prime.

Has durable metal clip, bend-resistant stainless steel tip, tungsten carbide rollerball, and the innovative Super Ink that protects against water, fading, and fraud.