You can get some altec lansing good sound pretty cheap.
or also Xmini, size of ping pong ball, portable, big sound
I find they work great, 34.00 + tx for a pair at Costco the 1st version, and other places.
they play very load with good Base, and very very portable
Must be recharged though, but they last 6 hours charged up at strong volume, But if your pluged in to your BBerry usb they will always be charged up