What you will need  and were to buy it:
3 X Raspberry Pi Zero Bundle : http://goo.gl/DDIAQ5
3 X Samsung 16GB EVO Class 10 Micro SDHC with Adapter: http://goo.gl/MJq0ip
3 X Micro USB 2.0 OTG Cable: http://goo.gl/zuSs8G
Micro USB OTG Adapter (small): http://goo.gl/34215R
1 X Mini-HDMI to HDMI Cable 3 Meters: http://goo.gl/lSeJsc
3 X USB 2.0 Network Adapter: http://goo.gl/jNV1z9
1 X NETGEAR  GS105NA Switch: http://goo.gl/n2DzZu
1 X IKEA KOPPLA 3-port USB charger: http://goo.gl/QxKdHJ
3 X USB cable: http://goo.gl/UzQQwl
3 X Ethernet cable: http://goo.gl/5MvxSh

By using our affiliate links, you help to support the channel as we may receive compensation for purchases through those links. 

OS version:
Raspbian

Part - 01

Part - 02

Part - 03