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
€2.82
in stock
1 new
from €2.82
as of April 7, 2020 8:21 pm
Amazon.es
€2.98
in stock
1 new
from €2.98
as of April 7, 2020 8:21 pm
Amazon.de
£6.80
in stock
1 new
from £6.80
as of April 7, 2020 8:21 pm
Amazon.co.uk
$13.98
in stock
2 new
from $13.98
as of April 7, 2020 8:21 pm
Amazon.com
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: