Here's a set of 9 glyphs (& hi-dpi versions) I made as a freebie (free for both commercial and non-commercial use) from FlatBox :)
Features: Nexus 4, iPhone 4S, iPhone 5, Android (generic) tablet, iPad mini, iPad (retina), Surface, MacBook Air, MacBook Pro (retina). I'll be adding more as people start requesting different devices. They aren't proportional to each other, for the sake of legibility and detail. Download link is below, enjoy!
https://www.dropbox.com/s/j11mgxjgm46mwbr/Device-outlines.psd