Philips is now offering their SBA1510/27 Portable Speaker System which is based on a previous design. The SBA1510/27 Portable Speaker System utilizes a 100-18000Hz frequency response, 4ohm impendance, 1Wx2 output power and a built-in bass pipe.
The Speakers can be transformed into a sphere shape just in case there is a carrying issue although it is already small enough to hold in your bag or pocket. The speaker will work in your USB port or a regular Stereo 50mm port. Expect to see them retailing for approximately $18.85.