Hobby lobby has enormous laminated foam boards. I know what I'm building this Taxmas. 10 foot flying wing. Or maybe a 1/3 scale Corsair. Something huge! : r/RCPlanes
Poster Board - 22" x 28" | Hobby Lobby | 865766
Foam Board - Painting Canvas & Art Surfaces - Art Supplies | Hobby Lobby
24x36 3/16" Black Foam Core Backing - Walmart.com
Extra Thick Foam Board - 20" x 30" | Hobby Lobby | 571133