If you have a small amount of electronics and mechanical skills, an Airsoft quality one can be made from one of those G&P or CA laser sights. Buy an IR laser (just the component - the high wavelengths can get very expensive, but the lower range is not so bad) and replace the laser unit inside.
I did this with a CA laser sight a few years ago. Works fine, but at the time I paid probably around 80-100 for the laser sight in the first place, and another 100 for the IR laser.
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