12 VOLT POE switches vs. 24 & 48 switches

I have a switch that has poe. I was under the false impression that all POE units were 12 volt. I was about to attach a cam to my switch and received an error having to do with possible over voltage. I did a little research and determined that mine puts out 24 volts.  I would have fried my camera if I had hooked it up. Many listings on Amazon do not list a voltage. I find that hard to believe. I also find very few that are 12 volts. Am I missing something here? Maybe  the cams have a voltage regulator in them? What brand or model number is a good on e for 8 poe cameras? Must be priced lower that $140.
Need -a- ClueRESEARCHERAsked:
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PoE devices will either be IEEE 802.3af or 802.3at compliant; or vendors will provide specialized injectors or switches for proprietary PoE devices.  See if your cameras are 802.3af/at compliant and if so get a switch with the same standard.  When you get ready to buy make sure that the switch has the number of PoE ports that you require.  I hear of a lot of people that buy a "24 port PoE switch" to find out later that only 8 of those 24 ports are PoE.  Usually a costly mistake, both time and money.
Dr. KlahnPrincipal Software EngineerCommented:
If you are satisfied with your switch other than it supplies 24V rather than 12V POE, go to ebay and buy inexpensive DC-DC converters at around $1 each.  These can drop the 24V down to 12V or whatever voltage the camera requires, and it is cheaper than replacing the switch.

Example unit:  http://www.ebay.com/itm/281621545687

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