Yeah, I installed a cheap 8 channel wired system I purchased from NewEgg, $230, where I used to live. That was about ten years ago. The system worked OK. The cameras weren't good at all at night. I ended up purchasing $50 separate boards and lenses but I don't remember where I got them. I think it was from http://www.SecurityCamera200.com I purchased cheap $5 plastic domes from Ebay to put them in. They allowed alot of light and worked good at night time when the outside lights where on. They stayed with the house when it got sold along with all the paperwork for them. Now I have to relearn everything I learned 10 yrs ago, and then some because I have to figure out the wireless part to the garage and shed.
SecurityCamera2000 inventory has been out for the last 6 months.
Those cameras you show look small enough I could probably hide in the tree or a bird house. They would never see them. I could use camo paint to hide them also.