The Sansa slotMusic Player made it onto my "Techie gifts under 50 bucks" because of the price, but what you're getting for $20-$35 is actually not bad at all. The player is about the size of pack of gum, and feels pretty solid in your hand. If you remove the cover, which is interchangeable, you'll find a place for a single AAA battery that powers it for up to 15 hours. Having a battery ...