Echo @tigercjn: you can find SSD1306 IIC (also called I2C) OLED screens on Aliexpress for a few dollars shipping included. Make sure it’s 4 pins (the non-IIC type has 6 or more pins which wouldn’t fit OpenSprinkler 3.0).
We are currently away till Monday July 21. Orders placed during this time will be shipped on Tuesday July 22. Thank you for your understanding!