Power Over Ethernet, a way of supplying power as well as data to devices (such as wireless access points) through CAT5 network cable.To the uninitiated (I.e. me) what is POE?
Have you looked at 'POE Midspans', they're basically severaly POE injectors monted into a single unit with a single psu.
POE Gigabit switches tend to be expensive because doing POE and gigabit at the same time requires power and data to be send down the same wire.