I bought big bubble wands from Oriental Trading and they were a HUGE hit today! The bubbles were huge, the wands were big and easy to grip, and everyone got their own matching one so there were no fights. Unfortunately after 15 minutes in each of my classes the bubbles were already running out. I'm looking for a good CHEAP bubble recipe that I can make over and over in the classroom without going broke so I can keep using these awesome blowers. Any ideas??