Best read up on the cliff notes here. CCTV Mall does sell cheap re branded chinese Dahua gear. If upgrading the firmware is not a issue or being hacked because you could not upgrade the firmware is not a issue then have had.
Note regarding CCTV Mall: When I was looking for cameras I did notice they have great prices listed, however once I entered my shipping information - the prices jumped significantly due to shipping. So do watch for that.