I did find some device that can do DAC/ADC or IO for $99. I did not find one that can also do SPI and I2C. one the web site, could give a link to a device like

I did find some device that can do DAC/ADC or IO for $99. I did not find one that can also do SPI and I2C. one the web site, could give a link to a device like Nusbio from the web site http://www.mccdaq.com/ http://www.mccdaq.com/