Amazon.com : BIC Refill for 4-Color Retractable Ballpoint Pen, Red/Blue/Green/Black, 4 per Pack (BICFRM41) : Office Products
BIC 4-Color Retractable Pen - Fine, Medium Pen Point - Refillable - Retractable - Multi, Black, Red, Green - 1 / Pack - Hobby Office Corp
Office Depot
Amazon.com : BIC 2 or 4 Colour Pen Refills - Blue (Box of 50) : Office Products
Amazon.com : BIC 4 Color Ballpoint Pen, Medium Point (1.0mm), 4 Colors in 1 Set of Multicolor Pens, 3-Count Pack of Refillable Pens for Journaling and Organizing : Rollerball Pens : Office Products
BIC 4color ballpoint pen PRO 1.0mm black refill set 4C PRO-RF5 | eBay
Pilot Frixion Erasable 4-colour Multipen Refill Wallet of 3