Hi OP. This one amazon is titled a cooling sheet, but it has apparently been recommended for oven use by a variety of sources: http://www.amazon.com/Professional-Cross-Wire-Cooling-Sheet/dp/B0001MS3DI

I don't know about this particular product,but have you looked at the restaurant supply places? Two websites I have used are KaTom and Bridge Kitchenware.

Anyone know where to buy racks that I can use with half sheet pans? When I search for such products all I can find are cooling racks, or non-stick racks. I'm looking for high quality (stainless steel or similar) racks that can be used for broiling or high heat baking. Thanks.