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nginx/1.14.0 (Ubuntu) If you've been longing for a portable MP3 player but have no intention of shelling out $250 to $400 for an iPod or one of its many imitators, you'll be glad to know there's a much cheaper — and in some ways equally cool — choice: a flash-based MP3 player. These handy devices, which store songs on a small silicon chip, cost about $100 and are often as small and light as a pack of gum.

Unlike the iPod and similar music players that rely primarily on hard drives to store songs, flash players have...