lighting dept.Do they...didn't know that...what department? lighting or?
runs about $15 for the full sheetlighting dept.
4 ft. x 2 ft. Suspended Egg Crate Light Ceiling Panel
Visit the Home Depot to buy PLASKOLITE 4 ft. x 2 ft. Suspended Light Ceiling Panel 1199233Awww.homedepot.com
Or do a group buy:if you want black, that's a LFS item... costs twice as much, unfortunately.