The very basic version of 3D glasses are available at very low price on the auction sites like ebay however one can still make these for free at home. What you need ?
1. Spare jewel case
2. A red and blue marker
You need to color the jewel case (transparent side as shown in picture) with red and blue marker. The size of the coloured area should be large enough to cover the width of your eyes. The blue (or cyan) color lens is for the right eye while the red color will cover the left eye. It is recommended to use water colors instead of permanent markers anyhow you can try both to see which one work best for you.