Your search for "fabric panels" revealed the following:
Cotton Canvas by the Yard
$8.99100% cotton canvas fabric by the yard. 60" wide stock is available in 3 fabric weights. Fabric is custom ordered...
12x12 Canvas Sheet - Orange
$2.99This convenient piece of 12" x 12" 100% cotton orange canvas is a makers dream come true. With not too...
12 x 12 Canvas Sheet - Natural Canvas
$2.49This piece of 12" x 12" 100% natural canvas is a makers dream come true. This perfectly sized sheet of natural...