DEBO USB TTL: Raspberry Pi USB TTL Interface Converter, CH340G at reichelt elektronik
20pcs CP2102 USB to TTL Serial Adapter Module USB to UART Converter Debugger Programmer for Pro Mini OPEN-SMART for Arduino - products that work with official for Arduino boards
954 - Adafruit - USB to TTL Serial Cable, 36", For Microcontroller/Raspberry Pi/WiFi Router
USB-TTL Serial Module - 5V and 3.3V — PMD Way
Amazon.com: USB to TTL Adapter, USB to Serial Converter for Development Projects - Featuring Genuine FTDI USB UART IC 'FT232RL' : Electronics
CH340G CH340 USB TTL Serial Adapter UART FTDI Router Upgrade ESP8266 Arduino | eBay
USB to 3.3v TTL PIN Header Cable with FTDI CHIPSET