Very cheap for a full sized Arduino compatible board. Cheapest I've seen so far.
Note: Mandatory $3 postage fee will apply for all orders less than $20 ATMEGA328P Nano V3.0 R3 Controller Board Mini USB CH340 Compatible for Arduino Project w/ USB Wire $4.39, 30% Off with extra …
MINI Version TDA7293 100W Mono Audio Amplifier Board DIY Kits 10A Electronic Production DIY Suite $5.55, 30% off now with free shipping! Click from …