USB drives getting cheaper and cheaper now. Sometimes we can get better offer of pen drive and no need to look for promotional usb drives too. In fact, these entire gadget stuff very fast drop price due to technology nowadays move real fast. Sometimes within one or two quarters, a hand phone or computer gadget can release few versions already.
USB drives very useful nowadays. Almost everyone will own at least one in their pocket. Some even use it to store games or MP3 songs. I noticed some company will give USB drives as gifts to their customers or visitors too.