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This is a Swiss Army Knife that fits into your wallet, and has a variety of tools ranging from a knife to a pair of really sharp scissors.
Link | Price: Around $25.
Fisher Space Pen
Probably the most reliable pen I've ever owned. Not only can I safely carry it around in my pocket without fear that it will leak, it's very reliable and will write on almost any surface, and at any angle.
Link | Price: Varies.
(Image: Fisher Space Pen Company)
3M Scotch-Brite microfiber cleaning cloth
Wipe fingerprints off your devices without causing scratches and smearing the grease.
What more is there to say? The description may be short, but these cloths are awesome.
Link | Price: Around $5.