Parker, if you can't find untreated cedar planks or heavy shakes, go to Fred Meyers, they carry 3 packs of "Oregon cedar grills" for $9.99. They are a one shot deal but sometimes I'll BBQ a second fillet while we eat the first...on the same plank...if it's not too charred......which is what you want to get that great
cedar smoke flavor.......also try seasoning with brown sugar or maple syrup........sweeeeet.