From Andy? I've a memory of a post mentioning someone who sells rebadged Dahua's, would that be it? But I can't find it.
If he's in the USA it's probably prohibitive,the post and pack charges. Most everything is.
Andy is from China. His company on Aliexpress is Empire Technology Co.
Below should be the link to his store page.
http://s.click.aliexpress.com/e/cKQJs7as
I am going to do my best to answer your questions. Please keep in mind I am not an expert at IP Camera's. I have been looking into them for about two weeks so I am very new to this myself.
As far as PoE, most IP camera's offer to be powered by either a power adapter plugged into the mains or by PoE. If you are going to run a cable to the camera you might as well just run the one ethernet cable. You would connect one end to a PoE switch (A switch that provides power to it's Ethernet ports for applications like this) and the other end to your IP Camera. Your switch would be plugged into your internet router so that the IP Camera's could get out to the internet, and could DHCP although you should use a static IP address I believe. This way you can just run the switch to the power outlet and then run all the other Ethernet cables from the switch to the camera's. You can also get a PoE injector but this won't scale well in my opinion. It's basically a power brick with two Ethernet ports. One goes to your switch and the other to your IP camera and it injects power.
Below is an example of PoE switch. There are different standards of PoE, so make sure you get one that suits your needs. The main two are PoE and PoE+. The + provides more power and I believe they are backwards compatible. I think most IP Cams are PoE and not PoE+ but I am still very new to IP Cameras myself.
https://www.amazon.com/TP-Link-Giga...TF8&qid=1506216067&sr=1-3&keywords=PoE+switch
Here is an example of a PoE injector.
https://www.amazon.com/TP-LINK-TL-P...8&qid=1506216133&sr=1-3&keywords=PoE+injector
IP Camera's many times come with a micro SD card slot, but this should be used as a backup and not the primary means of storage. If someone were to break/steal the IP Camera the SD card would be of no use, and SD cards are not as reliable as other methods of recording. I personally run SD cards in all my IP camera's but I also record to a server using
Blue Iris.
When you say "Do they make a dedicated mini computer for this task" (paraphrasing there), I assume you mean that handles the recording and power the device?
Are you familar with an NVR? It's like a DVR but it stands for Network Video Recorder. It's basically a box that has the software for connecting to and recording your IP Camera's. They have an internal hard drive where all your recordings are stored (sometimes you have to buy the hard drives separately), and some of them even have PoE ports built in.
Here is one with built in PoE.
https://www.amazon.com/Amcrest-NV21...8&qid=1506216665&sr=1-4&keywords=nvr+with+PoE
If you already have a powerful computer then you can use a software called Blue Iris or other similar software. This is like a virtual NVR in a way. An NVR is easier and more reliable, but I have multiple servers in my house so I went with Blue Iris.
I think most people would prefer Hardwired camera's vs Wifi Camera's as wifi can be unreliable and hard to troubleshoot. I personally have wireless IP camera's inside but it's because I am just learning about IP Camera's and I bought them as a baby monitor/IP Camera. So they are more of a toy but as a gateway into the world of IP Cam's they are neat. I am currently renting my own house and plan to replace them with real PoE IP Camera's when I move into my own house. One reason is I can't really be running wires through my rental house.
Are your IP Camera's going inside or outside? If they are going outside then the IP Camera below is highly recommended as it is a starlight and it's the best bang for the buck you can get. Basically it's regarded as the best outdoor IP camera in this price range. You would have to pay at least double to get a better performing low light IP Cam.
The model is Dahua IPC-HDW5231R-Z
I just ordered this one from Andy and I am awaiting shipment.
DAHUA 2.7mm ~12mm motorized lens 2MP WDR IR Eyeball Network Camera IPC HDW5231R Z ,free DHL shipping-in Surveillance Cameras from Security & Protection on Aliexpress.com | Alibaba Group
Let me know if you have any questions and I would be happy to try and help. A lot of these people on these forums are IP Cam snobs (no offense), so they take this very seriously and I think they get tired of answering the same questions over and over (which is understandable).