I was researching these and BH photo offered me a pair for $399 and it was too good to pass up.
Full retail is $720 and the usual price you see is $490.
The price for Vortex Diamondback 8x42 is $239.
At the other end, the Razor 8x42 HD is $980 and the Razor 8x42 UHD is $1300
There is a less expensive series, the "Crossfire". Also note that there is an older diamondback without the HD designation. The Crossfire are a bit heavier and bigger than the Diamondback. The coatings are better on the Diamondback.
I was surprised to learn that the Diamondback HD 10x50 are priced at only $239 on Amazon. Of course these weigh 30 ounces -- exactly the same as my Zeiss 8x42, but you get 10x rather than 8 and 42 percent more light gathering. This might be amazing, and reviews are good. But they say a 50mm objective is wasted for terrestrial viewing and if that is your game, stick to 42mm and save weight. The 10x42 sell for $249.
Tom's Bird Info / tom@mmto.org