With orders of $25 or more, Amazon offers Prime members the Uniball Jetstream RT BLX Retractable Rollerball Pen 12-Pack in Red/Black Ink, model no. 1858849, for $4.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping.) That's the lowest total price we could find by $5. These bold point pens features pigment-based ink and an embossed grip.

Note that this item is part of Amazon's "Add-on program" and can only be purchased with an order of $25 or more.