An interesting report from Ars Technica compares the pricing of the Xbox One and PlayStation 4 with consoles released in America all the way back to 1977 with the release of the Atari 2600. At E3 Sony announced that the PS4 would retail for $399, while Microsoft announced that the Xbox One would cost $499. These prices might seem high, but Ars took the prices of all the consoles released from 1977 to 2013 and adjusted them for inflation, putting together a chart that shows that most consoles cost consumers between $336 and $1200. According to the chart the average console price adjusted for inflation comes out to $498.63
Based on those numbers, the Xbox One is only one dollar above the average price of a console, while the PS4 is a hell of a lot cheaper. Of course, if you want some of that motion sensing magic that Kinect offers the Xbox One, then you'll need to buy a PlayStation Eye - which puts you right in the same pricing neighborhood when included with the console.
You can check out the chart as well as some other interesting statistics put together by Ars here.