Ten little digital spiders made me remember the old times, when we used the NE555 for almost anything needing a square wave or a timer. The data-sheet is present everywhere on the Net, no need to add on the price of this item.
Sure, the whole package consists of a small anti-static bag, and there is no data-sheet provided, but, hey, that's quite a bargain!
I needed those timers, and I had those timers for less than 0.16$ each, and that's what is important to me.