Where can I get those metal plates I keep seeing everywhere on cooking shows and sites like this ?

They are called sizzle/sizzler/sizzling plates and can be found at most restaurant supply stores.
http://www.webstaurantstore.com/oval-aluminum-sizzler-platter-8-x-11/407AZP11.html

They are called sizzle/sizzler/sizzling plates and can be found at most restaurant supply stores.
http://www.webstaurantstore.com/oval-aluminum-sizzler-platter-8-x-11/407AZP11.html

This looks kind of like it: http://www.amazon.com/Wilton-Armetale-Plough-Dinner-11-Inch/dp/B0074P83WG/ref=sr_1_3?s=kitchen&ie=UTF8&qid=1354044650&sr=1-3&keywords=metal+plate

Or maybe this one if you like 'em shinier: http://www.amazon.com/Charge-Jay-Stainless-Bridal-Charger/dp/B004RHY2EW/ref=sr_1_1?s=kitchen&ie=UTF8&qid=1354044710&sr=1-1&keywords=metal+plate