I picked these up in the dollar aisle of the grocery store I work at (Now THAT was hard to explain why I was buying all those. People were impressed when I told them though :D ) They were two for a dollar.
http://i208.photobucket.com/albums/b...08-07_1441.jpg
Just melted an entrance in it with a soldering iron (I made sure to soften any sharp points)
http://i208.photobucket.com/albums/b...08-07_1442.jpg
And there you go! All done, ready to start hiding some herps. For my whole rack's worth of hides, it only cost me $11. ONE exo-terra hide of equal size costs about 8 dollars. Think before you buy your hides.
http://i208.photobucket.com/albums/b...08-07_1443.jpg