Not familiar with Alphaeon's product but I know Latisse is the only FDA product that's proven to darken, lengthen and thicken lashes. Price varies depending on whether it's a 3mL or 5mL bottle but ranges from $80 to $180. You can check pricing from a doctor near you by clicking on the link below.
We sell both products in my office, but I have been much more impressed with the results my patients are seeing using Alphaeon's Eyelash Serum than from Latisse.My wife had used Latisse for many years to treat eyelash and eyebrow hair loss due to her allergies, with only some improvement. When she switched to Alphaeon's product, her results improved noticeably. I also like the fact that Alphaeon contains only "natural" ingredients, not prescription medication.