I forgot to mention the name of the site where we bought our ceiling tiles. It is www.talissadecor.com. This is a wonderful place, yanno! They have zillions of terrific tiles and a really detailed explanation of how to put them up yourself. I spoke with a nice guy named Vlad. Now, Vlad has this Russian name and a voice like one of the kings of France. :) He's super. VERY helpful man. I think he is the North American manager or something equivalent.
Anyway, if you are looking for a great way to spice up a room and want high quality materials at VERY reasonable prices, I say go to see what Talissa Decor has to offer! You will be glad. :D