when you get up above 10X, it starts to get tricky to find good glass that doesn't end up straining your eye's after long amounts of use, and you loose a lot of low light viewing!
so heads up
and this is why much of the higher power bino's and such get costly,., and why the good one's tend to have much larger Objective lens, its need to get more correct eye relief/less eye strain and help compinsate for better use in low light conditions!
I have not looked at any recently, but yrs back when I sold optic's
there were some bino's that offered some ZOOM, meaning they had adjustable power , like a variable scope does
you could say go from 8x to 20x, they were fairly cheap too, and showed it in quality, but for simple viewing of things, they did what they said
the issue was again glass quality, and size of pupil's, /objective lens as to Eye lens, the ratio is what matters on eye strain (to a point)
and light gathering and eye strain from it
but if you look about you might find a cheaper pair, but if you do a LOT of looking thru binoculars at a time, your going to want to sva eup and BUY good one's, your eye's will thank you as will NOT getting migraines !