Cheap/budget NVR setup

I get about 8 hours on a 32 gig card, 1080p, 20fps, 8192bps, CBR
That might be an option, with motion detection recording.

What are the cheapest models with SDcard from Dahua and Hikvision ?
One of the camera will be for overview so I don't need too much resolution. (That camera I will use it to remote watch some hamradio antenna, and if it survived heavy wind/ice)