Make one and film it!
We spent about £4 per UFO building ours (steel bowls from a really cheap shop).
This is an oldish pic from a location test. They've been painted more, and had a lot more detail added since (guns etc).
It's a lot more fun than nicking someone else's pic and as a bonus you get an original design. You also get to film it from whatever angle you want. http://www.deadbit.org/aotasr
for more info & pics etc.