USB Serial Light Adapter (Arduino Compatible) [DFR0164] - 13.20EUR : komputer.de, Arduino Open Source Hardware
Nettigo: USB/Serial converter [Arduino A000059]
USB Serial Light Adapter (Arduino Compatible) - DFRobot
USB Serial Light Adapter (Arduino Compatible) | DFRobot DFR0164 | Core Electronics Australia
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Amazon.com: WITMOTION USB-UART Converter 3-in-1 Multifunctional(USB to TTL/ USB to RS232/ USB to RS485) 3.3-5V Serial Adapter, with CH340 chip Compatible with Windows 7,8,Linux,Arduino for Development Projects : Electronics
Arduino USB-to-Serial Tutorial - Programming the Pro Mini - YouTube
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USB Serial Light Adapter (Arduino Compatible) - DFRobot
USB/Serial Light Adapter - Geeetech Wiki
USB/Serial Light Adapter - Geeetech Wiki
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USB Serial Light Adapter (Arduino Compatible) - DFRobot
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Arduino USB to Serial Converter
USB Serial Light Adapter (Arduino Compatible) - DFRobot