DIY Infrared Goggles for under $10
 

http://www.amasci.com/amateur/irgoggl.html

How to make near IR vision goggles for ~$10 with light filters and welders goggles. "The whole world looks blue-grey with deep red highlights. Many plants look frosty-whitish-pink with the goggles, but for normal human eyes they look green or greenish black. Sometimes you can see birds moving around deep inside the frosty white bushes and trees."