Help with security system


I recently purchased a 4 cam security system with a 1 TB hardrive to install around my mother-in-laws (recently widowed). Each camera had a 60 foot long cable to get back to the dvr but only a power supply cord about 8 feet. Long story short, the placement of the cams is not going to allow for the use of a power cord without an extension (out of the question). I know that some of these bullet cams can run on power delivered through the USB but I cant seem to find any systems set up like this. Does anyone have any familiarity with this? Im looking for a true plug n play system where I cant mount cams and run ONE cord back to the dvr and be able to record/view. Someones got to make this right? thanks for any feedback...