Amazon has BIC 4-Color Ballpoint Pen, 3-Count for $3.20 (Reg $8.49) with free shipping on orders over $25.
The BIC 4-Color Ball Pen provides four ink colors in one convenient design for fun and colorful expression! deal for Bullet Journaling, color-coding, editing, and organizing copy, this pen allows you to choose between blue, green, red, and black ink with a push of a button.
This BIC 4-Color Ball Pen has a 1.0mm ballpoint that is perfect for everyday writing activities.