Canada drop Omega 1801 Ceiling Tile is a standard inexpensive tile that is great for finishing basement, bonus rooms, bedrooms, etc.
The tile is 5/8" thick and 2' x 4' in size. It comes package in a box of 10 pieces, so you get a coverage of 80 square feet per box. This is a residential grade tile with a flush edge, so it sits even with the ceiling grid.
This product is sold by the box.