Where would I find a large dance mirror?

http://www.alvas.com has a selection of mirrors specifically made for dance. Their mirrors use the same amazing space age super reflective material used in the Hubble Space Telescope.  An image good enough for the stars. Their glassless mirrors are made from a metallized plastic film, and they give a brighter, sharper reflection than plate glass, with no ghost images.  Their popular 4' X 6' vertical mirror, with stacking wheels, weighs only twelve pounds! Best of all, their mirrors won't shatter, making them much safer than glass. You can't beat that!