K-Mart has them. I think I've seen them at Kerr Drugs, as well.
They run about $15-$16 each glove. If memory serves, they're rated up to 500*. They're made to quickly move hot items. The heat will build up if you hold an item too long. When baking something at 350*,for example, they're fine for taking the pan out of the oven to put on a cooling rack. They're good, too, working around a grill or smoker.
Lee