I want to put in a dropped ceiling. The cheapest way to go is with Armstrong 2 X 4 flat type tiles; ie the lay flush with the grid. I'd prefer 2 X 2 tiles thought. The cheapest method would be to buy the 2 X 4 tiles and cut them in half. I do like better the 2 X 2 tiles that lay slightly below the grid; 3 dimensionaly - they are quite a bit more money though. Here at work we have what appears to be a 2 X 4 3 dimensional tiles that that have a false grid cut through the middle...thus it looks like 2 X 2 tiles. I'd imagine these might be less than the 2 X 2s. Trouble is, I do not see them for sale anywhere. Ideas?
***Also, do the 2 X 4 cheapies provide less noise reduction than the 3 dimensional ones?