Amazon.com has the 12-Pack Pilot G2 Premium Ultra Fine Point 0.38 mm Gel Roller Pens for $12.15 - 5% off w/Subscribe & Save = $11.54. Free Shipping w/$35+ Order or Amazon Prime.
Note: Prices on Amazon.com fluctuate regularly, and deals can expire anytime. Refer to the post time to see when it was listed.