Well an enterprising guy in Italy has created a website showing which online stores have Raspberry Pi Zero and Zero W’s in stock.
It is called The PIlocator.
As yet there is no pricing information on the website and so you must follow the link to the online store to find a price. But at least you can be sure they will have boards in stock.
The IoT-enabled Raspberry Pi Zero W features a 1GHz, single-core CPU, 512MB RAM, Mini-HDMI and Micro-USB ports, composite video and reset headers and a CSI camera connector, along with 802.11n wireless LAN and Bluetooth 4.1 wireless connectivity.