Where to find infrared sensors?

RadioShack used to carry an item called an "infrared sensor" (part number 276-1099). It's just a piece of paper that changes color when IR light shines on it.

Unfortunately, RadioShack no longer carries this item. Any idea where I can find it or something similar? I see all sorts of expensive electronic sensors... but this was just a piece of paper that cost between 3-5$.

a cell phone camera or some digital cameras will detect ir wavelength

werejag said:

a cell phone camera or some digital cameras will detect ir wavelength

Click to expand...

Cool. My digital cam doesn't, but I didn't think to check my cell phone cameras. That's definitely a start!