Tandem Pen/Highlighter
The Paper Mate Tandem ($5) combines a ballpoint pen and highlighter to make sure you'll never have to dig around looking for one or the other when you need it. The super handy two-in-one writing instrument features a twist grib, Lubriglide ink system, and smear resistant highlighter ink. In addition, the highlighter unit can be replaced with a refill after you've used it to mark all of the dirty words in the Dictionary at the library.