Cortex M4 eval boards with 1 MB flash, 192 KB ram, 3 axix accel, mic,
adc, dac with speaker amp, USB OTG, etc, under US$ 15:

http://www.mouser.com/ProductDetail/STMicroelectronics/STM32F4DISCOVERY/?qs=
=3DJ2qbEwLrpCGdWLY96ibNeQ%3d%3d

Bob

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