Amazon.com offers the Physicians Formula Eye Booster 2-in-1 Lash Boosting Eyeliner + Serum for $6.57.

http://www.amazon.com/Physicians-Formula-Eye-Boosting-Serum/dp/B004HYRH06

Add-on items, can only be purchased with an order of $25 or more.

Features: High-tech Japanese formula is long-wearing, water-resistant and smudge-resistant; Ultra-Precise Brush-Tip Applicator: Innovative and easy to use eye lining tool delivers effortless; Hypoallergenic; Fragrance free; Paraben free; Dermatologist approved; Safe for sensitive eyes and contact lens wearers

This is a great everyday liner!