Probably the cheapest 4k monitors in the market at the moment: http://pricespy.co.nz/category.php?k=v2192&o=produkt_pris_in…
Overview from Ascent
The visually impressive U2879VF combines an expansive 28” screen size with 4K Ultra HD resolution for super-sharp, highly detailed images. The 10-bit Deep Color panel can display over a billion hues simultaneously, for superb realism and natural shading. A blisteringly fast screen response time of just 1ms shows fast-moving action without blurring, while AMD FreeSync Technology matches the graphics signal to the screen timing to eliminate stuttering and tearing. Ultra-high dynamic contrast of 80M:1 intelligently adjusts brightness to reveal darker image details with greater depth and clarity. A full range of input connectors, including fast DisplayPort and Dual-Link DVI technologies, ensure compatibility with every device. The audio jack allows convenient attachment of headphones or desktop speakers.