Banggood.com continue offering great deals for hobby and diy stuff in January 2015.
These are pretty the same as deals that we saw from Banggood at the end of the 2014
If you need a flight controller for you DIY multirotor consider OpenPilot CC3D on STM32 chip with protective case and set of connector cables:
- OpenPilot CC3D Flight Controller is available for $15
You can still grab 8 channel video receiver for $20:
Another interesting thing offered is the 2-axis gimbal controller for just $15. This product currently doesn't have any rate or feedback so this might be just bad clone but anyway here is link if you want to try it for this price:
Other avaialble deals are listed on the DIY Multi-Rotor Jan 2015 promotion page.