from time to time I've seen FOIL ones by Ecko at walmart. and
I've even seen them by Reynolds http://www.reynoldskitchens.com/reynoldskitchens/kitchenconnection/products/bake_cups/index.asp
here's a link that sells both silver and gold foil (last 2 items on page)
http://www.birthdaymonster.com/showcategory.php?id=6
and all kinds of baking cups
http://bakerstools.com/Merchant2/merchant.mvc?
I use foil cups. They're a little more expensive, but not prohibitively so. They hold their shape well, no greasey spots, and actually make your cupcake look more attractive. They come in various colors, so you can use red and silver for valentines day, silver for everyday, etc.
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