If you haven't heard about OpticsPlanet making a special purchase from Nikon on the Nikon Ecobin 10x25 binocular, you really should check it out, especially if you are in the market for a compact binocular and especially if you are in the market for a good compact binocular at an unbelievable price.
Okay, what is the world's best selling compact binocular under $100? Based on numbers sold, years in production and value for the money, the world's best selling compact binocular under$100 title would probably go to another Nikon binocular, the Nikon 10x25 Travelite, or, perhaps, one of the competition's binoculars, such as the Pentax UCF X II 10x25 binocular. Both are great compact binoculars for the money, but neither one of these compact binoculars is waterproof and eye relief on the Nikon Travelite 10x25 is a bit stingy for eyeglass wearers.
In the past, Nikon binocular fans had to step up to the more expensive Nikon Prostaff 10x25 binocular to get a waterproof binocular and a 10x25 that has enough eye relief to be used easily with glasses. Not anymore. The Nikon Ecobin 10x25 is essentially a Nikon Prostaff 10x25 binocular but with more ecologically friendly features in its production. Like the more expensive Prostaff, the Nikon Ecobin is also waterproof and the Ecobin has the same eye relief and field of view. It's the same binocular! That Ecobin price, though, is hard to believe. I'm going to buy a couple for my nieces and nephews at that price.