30hz is WHY its so cheap.
I don't really buy that this is the case, I feel that it's an artificial limitation. I wouldn't be surprised if the panel itself is 60Hz capable, but the controller board is hard limited to 30Hz. I'm not buying that a board capable of 60Hz is so much more expensive to produce to reflect the cost differences. I reckon companies who are selling 30Hz ones NOW are doing it because they see them as cheap stop gap monitors that people will replace fairly soon with 60Hz + ones.
It is however good to see monitors using this resolution are dropping in price, as it only means UHD's mainstream status isn't that far away.