Scroll down to compare the ESP32 SX1278 at different stores and find the best price.
eBay - ESP32 SX1278 LoRa with OLED Display
$19.87
eBay
Banggood - ESP32 SX1278 LoRa with OLED Display
$44.49
Banggood.com
Amazon.com - ESP32 SX1278 LoRa with OLED Display
Amazon.com
Amazon.co.uk - ESP32 SX1278 LoRa with OLED Display
Amazon.co.uk
Amazon.de - ESP32 SX1278 LoRa with OLED Display
Amazon.de
Amazon.es - ESP32 SX1278 LoRa with OLED Display
Amazon.es