Adafruit 2264 USB to GPIO, SPI, I2C Breakout Board

Adafruit-USB-to-GPIO-SPI-I2C-Breakout-Board-Adafruit-2264-P-The-Adafruit-FT232H-USB-breakout-board-is-the-Swiss-army-knife-for-serial-communications-with-access-to-SPI-I2C-serial-UART-JTAG-and-others-This-means-your-laptop-or-PC-can-talk-directly-to-displays-sensors-and-other-devices-you-would-normally-interface-to-through-an-Arduino-Raspberry-Pi-or-similar-gadget-You-can-also-program-it-to-have-12-x-GPIO-lines-opening-more-possibilities-When-you-add-all-this-to-the-Adafruit-Pytho

Price: 18.61 from Rapid Online Rapid Electronics Ltd.