There are portable speakers out there of every size and shape but the Stroll-a-Tune is one of the most practical ones out there. The small speaker is designed to attach to a baby carriage so that you can listen to your iPod, Mp3 Player or radio while strolling your kids around. Aside for keeping the parent entertained, it will also keep your child entertained as well. And it’s also a lot safer than wearing headphones. The Stroll-a-Tune speaker retails for $29.99.