Amazon.com: 3.3V 5V FT232RL USB to TTL Serial Converter Adapter Module for Arduino 4 pcs : Electronics
USB to TTL Adapter Module | ThinkRobotics.in – ThinkRobotics.com
USB 2.0 Cable Type A/B — Arduino Online Shop
Amazon.com: Cylewet 2Pcs FT232RL 3.3V 5.5V Module USB to TTL Serial Adapter Module for Arduino Mini Port USB to Serial Interface Module (Pack of 2) CYT1007 : Electronics
UART-Serial-USB : USB Serial Adapter with XBEE Mount / Rail ...