Does anyone know where I can purchase mylar curtains (for a stage), and do you know an approximate price range? Thanks!

Check out Rose Brand - http://www.rosebrand.com - they're a little pricey, but they're good, and you'll get a sense of what you're getting yourself into, cost-wise.

It'll depend on how large you need them, how thick you want them, etc.

-amanda

P.S. they're often referred to as "rain curtains", and they come in either mylar (metallic) or vinyl.

http://www.rosco.com/us/propscenic/slit_drape.asp
Rosco is a huge supplier of this type of backdrop.

Thank you both very much- that was exactly what I was looking for!

Don't go cheap on these as they will not hold up if you don't get quality rose brand is for sure.