If you want cheap goggles for FPV and dont care about how it looks I can recommend to trash a pair of Trimersion 3001AD and screw it to an ordinary baseball hat. I bought it on ebay for 99$ shipping included. Works really great.
http://shop.ebay.com/i.html?_nkw=Trimersion

There are several mods in this forum http://www.rcgroups.com/forums/showt...=925051&page=7
I took out the video board with optics, hard wired the 5V and the video signal and attached it to a baseball cap (without the cap). Very simple, lightweight and comfortable. Ugly thou... I also glued a plastic can on it to protect the electronics. This mod is about 2h work...

The 5V is made out of an Hextronik UBEC and and 2S lipo.

This picture shows how to connect the video signal and 5V. I just cut the wires of and soldered my inputs to the cables.

This is a build log over my tricopter. I call it TriBoCopter.

Basics:
Weight 825g (with 2150mAh 3S)
Radius 360mm

Material used:
- Electronics
1 x Gyro Telebee Head Lock & Standard Gyro
3 x Gyro HK401B
3 x Motor hexTronik DT750 Brushless Outrunne
3 x Esc TURNIGY Plush 18amp Speed Controll
3 x Propeller GWS1147
1 x Servo Digital metal gear servo 16g/2.2kg
1 x BEC HXT UBEC
- Chassis
2 x Plate of 1.6mm FR4
1 x HK-T500 Landing Skid
2 x Carbon Fiber Square Tube 750x10.5mm
1 x Carbon Fiber Tube (hollow) 8x750mm
3 x Teflon tape strips (for bearings in between the 8mm CF tube and the 10x10mm tube)
3 x Home made machined motormounts (Tilted 4deg. for a level hover.)
2 x End plugs for fold able 10x10 CF parts
1 x End plug for the rudder arm (glued in the 8mm CF tube)
2 x Washer for the rudder arm
1 x Home made aluminium rudder arm
1 x Plastic washer (for distance)
1 x HK450 Canopy

Video:

First real test flight
First hover Here

CIMG6511.AVI (0 min 34 sec)

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