The BT-1 8-Channel FPV Joystick is capable of interfacing with your transmitter (via trainer port) with the included FPV control box, and allows you to control up to 8 channels independently. There are 3 proportional channels, and 5 on/off channels. The BT-1 offers you the ease of flying your FPV model with just one hand.
Throttle lever for smooth, easy throttle control
Easily accessible trigger and function buttons
Price is US$ 99.32 (but may be lower after logging in onto the Hobbyking website or after waiting for a pop-up with a one-time-offer).
More information: http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=...