You might not know the company F&V, but you should. Among many other intriguing products the monitor they just released stands out among the affordable 7-inchers.
It is extremely basic, peaking is the maximum fun you will have with this baby, but quality wise its display delivers a sharpness that impressed me and the casing seems robust and lightweight.
Resolution is 800×480, like most other field monitors and allow for good focusing (if the panel and software is right.)
The hdmi version is 199€ ($270).
There is an HD-SDI version that sells for only 349€ ($480).
Get the F&V 5” monitor