Banggood.com
Recommended reading: Best ESP8266 Wi-Fi Development Board
Scroll down the page to compare the ESP-01 Board price at different stores. You might also consider buying a ESP-01 Serial Programmer Adapter.
Ebay.com
Aliexpress.com
€2.68
1 new
from €2.68
as of January 21, 2020 12:06 pm
Amazon.es
€3.41
1 new
from €3.41
as of January 21, 2020 12:06 pm
Amazon.de
$13.98
1 new
from $13.98
as of January 21, 2020 12:06 pm
as of January 21, 2020 12:06 pm
Amazon.co.uk
ESP8266 is a highly integrated chip designed for the needs of a new connected world. It offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or to establish an Internet connection.
Learn more about the ESP8266 board: