I am a big fan of Adafruit. What she sells is tested, documented, and the documentation will still be available long after she stops selling the product. You will pay more than you do from other sources, but for beginners, the tutorials and code provided makes all the difference in the world. Unless you like reading datasheets instead of getting the led to blink.

Parts

• Raspberry Pi: https://www.adafruit.com/product/3055
• Micro SD Card, 8GB min: https://www.adafruit.com/product/1294
• Raspberry Pi Camera: https://www.adafruit.com/product/3099
• PIR Sensor: https://www.adafruit.com/product/189
• POE Splitter: https://www.adafruit.com/product/3785
  • It was easier for me to run an ethernet cable from my switch that does Power Over Ethernet(POE). Just watch how you have it. By default the voltage is 48V. That will let the blue smoke out.

Prototyping

Raspberry Pi Console Cable: https://www.adafruit.com/product/954

• For those who do not need a stinking GUI even for initial setup. Male Male Jumper Wires: https://www.adafruit.com/product/759

PIR sensors are pretty much the same. Track if yours is 3.3V or 5V. How the sensitivity is adjusted can be jumpers like this one or a adjustable resistor. https://www.parallax.com/product/555-28027

This makes prototyping on the Pi easier: https://www.adafruit.com/product/2028

Of course choose the breadboard of your choice: https://www.adafruit.com/product/239

On a first pass, I love these, https://www.adafruit.com/product/591 since they are very high quality and map 1:1 to your bread board, since that is what they are.