Beat Box – Flat Pack Speaker Stereo – only $2.99 with Free Shipping.  The amazing Beat Box Flat Pack Speaker features two quality amp speakers that fill the room with the tunes from your smartphone, iPod or mp3 player. The best use of cardboard ever, you can pop up this boom box for instant music at the beach, when camping, in the dorm or anywhere you travel – simply flatten it when the party’s over and put it back in your bag!