LA Colors Grafix Teal Liquid Eyeliner ($1.50) is the perfect alternative for anyone on a very tight budget. I bought mine at Dollar General where they had several different colors to choose from.
Too Faced Cat Eyes Eyeshadow and Liner Collection ($36) is a palette of nine different shadow colors in which three of those can also be used as eyeliners. The leopard printed tin packaging is adorable!
Jordana Black FabuLiner ($1.99) is a liquid eyeliner pen with a stiff felt tip. It is extremely pigmented and applies so easily to the eyelids. Very little pressure is needed to get an intense line of black.