RoverMux R/C multiplexer is on sale for only $6 (buy here, coupon code EB024FC) on Tindie
There are 100+ additional items from many other makers on sale at Tinde today. Tindie is like Etsy for electronics/robotics. https://www.tindie.com/blog/thanksgiving-2013/
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Here are more Cyber Monday sales: http://dronelifestyle.com/best-cyber-monday-deals-for-drones-2014/