If yiu become reseller you get them much cheaper. But I know it is expensive but compared to the free ones I have tested it is worth every a penny for me. I have them setup now so videos taken is directly sent away from the house to an ftp server outside. And the motion detection is outstanding from anything else I have tested.
I got 2 additional cameras I mentioned but… Now I use only 3 in total.
I also reinstalled Shinobi and now it supports hardware acceleration on raspberry.
Looking at my CPU usage with 3 cameras, it looks like 4 possible and with tweaking (like lowering resolution and fps) maybe 5-6.
Don’t know about audio impact of you want to record that.
I also had, for short period of time, barking detector 
I used noise component which monitors audio stem 3 from camera.
It’s not reliable because ffmpeg service tends to freeze. I had to do automation to restart it ever 10 minutes … And when it starts it shows noise detection … So you have to filter that out … I don’t recommend it.
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