8-Port Gigabit POE Network Switch for Mobile Installations (DC12V-48V – MobileMustHave.com
Single Port 10/100M PoE Splitter Cable with DC 12V Output, 13W - FS.com
Amazon.com: Mini Industrial 3 Port Gigabit PoE Switch with DC12V-48V to DC48V Voltage Booster Hardened RJ45 10/100/1000Mbps 802.3at 30W/Port Ethernet Switch Din Rail Mount Compatible with IP Camera VOIP Phone : Electronics
PoE Power Over Ethernet Splitter Adapter 48V to 12V, IEEE 802.3 at Compliant 10/100Mbps PoE Splitter with 12V Output for Surveillance Camera - Walmart.com
802.3af PoE Output Data & Power Splitter - 5/9/12V : ID 3239 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits