White Amplifier ($10): For an inexpensive quick fix, Poppin's White Amplifier works with the original iPhone, iPhone 4 or 4s. The amplifier is made of white silicon and is washable so you don't have to worry about party fouls - just make sure your phone doesn't get spilled on. The amplifier boosts your phone's speaker sound 13x and you don't need additional batteries. You can slip your phone into it either vertically or horizontally and start playing music.
Mickey Speaker ($20): For a cute plug and play option, I love these Mickey Mouse speakers imported from Japan. They come in blue, pink or green and the sound quality is great coming from this little guy.
Mini Dog Speaker: ($24): Probably not the best choice for a huge blowout, but if you're hosting a smaller dinner party, this Mini Dog Speaker could be a really cute addition to your party décor. Plus, it works with any device with a 3.5mm phone jack.
Drop Portable Speaker ($55): I'm a sucker for cute things and this teardrop shaped portable speaker is very cute. You turn the top of the speaker counter clockwise to open it and place your music device or mobile inside. There are control buttons across the front of the speakers so you can switch tracks and adjust the volume. This makes sure your music player is safe if the party gets too rowdy.
JamBox ($299.99): Going into the higher quality and more expensive end, if you want to invest in something with great sound but is still small and portable, Jawbone's JamBox is a good one to look into. It works with any mobile or tablet device. It's completely wireless so you can stream all your music files from any Bluetooth device and control it wirelessly. There are precision-tuned drivers and dual passive bass radiators for amazing sound quality. (Images: As credited above.)