OK, it seems that there are tons of 4K desktop and laptop displays as well as the 4K TVs that will be coming in sometime this year or in the future.
Dell has announced that their 4K monitor will be arriving at $699. Downside is that it is running at 30Hz and it's not useful for smoother multimedia purposes as if it's a pointless monitor to buy. Your best bet will be to wait a few months for other monitors to arrive as they are having 60Hz.
So speaking of waiting a few months, Asus will have their own monitor that will have a 1ms response and the special blue light filter that will reduce the flickering on the screen. Price will be more expensive though at $799. There's another one from Lenovo which will go on sale in April compared to Asus' monitor which will arrive in the second quarter of the year.
Expect even more of these that will be arriving this year with better prices and specs.