Best price for Lenovo 10R0PAR1AU 21.5in is $467.11 inclusive of GST. This is presently the cheapest offer found from comparing prices from 2 shops in New Zealand.
Response time is measured in milli-seconds (ms) and represents the time it takes for one pixel to go from active (black) to inactive (white) and back again. Needed to adapt to the constantly changing image on the screen. The lower, the better.