Latisse costs $120 but can last up to 4 months.

 I've been recommending a different regimen that will let your Latisse bottle last up to 4 months. We recommend starting with 1 drop in the cap (not 2); then soak the applicator tip in the cap and apply to the lash skin once daily. We also suggest using each disposable applicator on both eyelids for 2 consecutive days before discarding. It can be rinsed with water in between uses, and left to air-dry. This regimen will allow the 60 applicators included with the purchase to last for 120 days.

You'll see results in a month, and thick growth in 3 to 4 months.