Fog Machine on Location
If you want to do it cheaper you can do it without a fog machine. Just an idea you can try it yourself.
Obtain some dry ice. Put the dry ice in a bucket. Pour room temperature water over the ice until it is covered. Dense fog will begin to rise out of the bucket. If you want some different methods to produce fog cheaper you can Google it.
|Fangorn Forest by cand1d|
|Yosemite Falls with Moonbow by Jonathan Shapiro|
from Best Landscape of the Week 4