If you look at the dates of their posts, you'll see those folks bought product several years ago. This is back when the product was distributed by TRUGLO. The TRUGLO version of SureSight hasn't been available for years.
At this time, the SureSight website is the only place to purchase the new version. (Actually, until next week, you'll have to sign up HERE
in order to pre-order)
Hope that clears things up,