I had been planning on making a few of those myself. Nice work there.
I also had the idea to have 24 clocks lining the top of the walls in my office. Each one would represent a different time zone and would have the name of the biggest major city in each time zone under it. Like you see in the war rooms from the movies.
So needless to say, I needed a cheap source for plain clocks. Wal-Mart had them for like $3 each back when I came up with the idea. I am lazy and never got around to it, though, and in the meantime the price went up a buck or two.
So I guess the moral of that story is Wal-Mart has pretty cheap clocks as well.