<< How much do these things cost now? >>
Depends on the type. The LED is basically the same, but some are worse than other. The large difference is in it's casing. Cheap one has stiff switch that's flaky. Nicer ones have better more responsive switches and sometimes a hold key so you don't have to hold it down to keep lit. There is even a fancier version that let's you change intensity, also flash mode with different flash mode.
Mine is plain and simple. $10. The fancy one from PhotonMicro with all the bells and whisles goes for $25 to $30.
<< Where did you buy it? >>
At a mall. The easiest place to get it is eBay.. unfortunately.
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Whta are they for? >>
Illuminating light. Each color has unique property. Red for checking on people without waking them up, blue for lighting up a trail, green=most powerful since our eye is most sensitive to that color, white=full color. They're also popular with ravers since it attracts them so much attention.
<< Whya re hotels buying them? >>
I have no idea
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Are some different than others?
Are some cheaper? >>
Yes and yes
The original one comes from here
