Canada drop Mega 2101 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 2' in size. It comes package in a box of 10 pieces, so you get a coverage of 40 square feet per box. This is a residential grade tile with a reveal edge, so it drops down from the ceiling grid slightly.
This product is sold by the box.