The Raspberry Pi Zero is a fantastic, miniature version of the Raspberry Pi that shrinks the board down to about the size of a stick of gum, but one problem with it is the lack of wireless features. The Raspberry Pi Zero is a new version that packs in Bluetooth and Wi-Fi for double the price of the original Zero.
Source: LifeHacker – The Raspberry Pi Zero Wireless Adds Wi-Fi and Bluetooth to the Zero, Costs