Amazon.com: Baltic Birch Plywood, 3 mm 1/8 x 12 x 24 Inch Craft Wood, Box of 12 B/BB Grade Baltic Birch Sheets, Perfect for Laser, CNC Cutting and Wood Burning, by Woodpeckers :
Amazon.com: FSWCCK Pack of 8 PCS 12 x 12 Inch Craft Wood, Plywood Board Basswood Sheets, Perfect for DIY Projects, Drawing, Painting, Laser, Wood Burning, Wood Engraving and Laser Projects