How to view IR source cheaply

Just in case if you already do not know, you can any
Digital camera to view them. Except for the DSLR as
this one needs to take the photos first since what
you're seeing is the image reflected from the mirror
and prism back to the viewfinder and not directly
from the CCD element itself. So, you can use your
Mobile Phone to do this too. So, it would be silly to
waste Rm19.90 (and maybe a burnt finger) for a DIY
IR detector when you can spend hundreds and
thousands of ringgit for a honest to goodness real
deal Digital cam to do it for you. Hah.