This is a good one:
Milwaukee M12 12-Volt Lithium-Ion Cordless M-Spector 360 Digital Inspection Camera (Tool Only)-2313-20 at The Home Depot
Although it's another $100 if you don't already have the battery and charger (Though the M12 line is great if you happen to be in need of any new cordless tools. I couldn't live without my cordless rotary, multi-tool and right angle drill).
I have a milwaukee one but not this one with the rotating screen. It's been handy for electrical work and boat work. The rotating screen deals with the issue of camera orientation. Without the rotation I find it surprisingly tricky to keep track of up and down properly so I consider that a pretty big plus.