Preisvergleich für Udi U939 Nano Quadcopter in Deutschland bei Shoppdeal.de in November 18, 2019
It is available for $24.49 shipped with coupon code BESTBG at the following link http://www.banggood.com/Udi-U939-2_4G-4CH-6-Axis-Mini-RC-Quadcopter-With-Protective-Cover-p-952076.html?p=KA3003555189201404MR
This U939 is a U839 but with a faster yaw rate in expert mode. The most sporty nanoquadcopter, one of my favorite by the way RCgroups thread: http://www.rcgroups.com/forums/showthread.php?t=2298714 You can find this product at BG: https://www.banggood.com/Udi-U939-2_4G-4CH-6-Axis-Mini-RC-Quadcopt...
This is my review of the UDI RC U840 Nano