4-channel I2C-safe Bi-directional Logic Level Converter [BSS138] : ID 757 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
2/4/8 Channel Iic I2c Logic Level Converter Bi-directional Board Module 2 4 8 Way Dc 3.3v/5v With Pins For Arduino Raspberry Pi - Instrument Parts & Accessories - AliExpress