BenQ has el-cheapo but relatevely high quality screens.
A 17-inch can sell as low as 230 euros (287USD) but the cheapest ones usually lack the speed required for gaming.
You see, you can get an awesome flat screen for office use.. But for gaming its a whole new ballpark. You need to be looking for screens with maximum of 16ms refresh times. Best at the moment are 8ms.
For a 8ms 17" screen you'll pay roughly 500USD while you can get a 19" for around 600USD with the same speed.
So the price point is not appealing at all for a small screen.