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USB to TTL Serial Cable - Debug / Console Cable for Raspberry Pi : ID 954 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
USB 2.0 RS-232 Serial Adapter with LED Indicators
FT232RL 3.3V 5.5V FTDI USB 2.0 to TTL Serial Adapter Module Arduino Moni Port | eBay
L1: Turning on an LED - Physical Computing
USB 2.0 RS-232 Serial Adapter with LED Indicators
USB 2.0 RS-232 Serial Adapter with LED Indicators
Sonoff Programmer, USB Serial With 3.3v Regulator (with Pictures) - Instructables
SparkFun Serial Enabled 16x2 LCD - White on Black 3.3V - LCD-09067 - SparkFun Electronics
Serial communication between MSP430 Launchpad and PC | xanthium enterprises
Amazon.com: DaFuRui RS232 to TTL Converter Module,5PCS MAX3232 3.3V to 5V RS2323 COM Serial Prot Board to TTL Connector for Arduino Microcontrollers : Electronics
Amazon.com: TTL-232R-3V3 USB to TTL Serial 3.3V Adapter Cable 6 Pin Female Socket Header UART Serial RS232 Download Cable Windows 10 8 7 Linux MAC OS : Electronics