I kept waiting for these to go down in price and I ended up getting a set of 10 for about 4 bucks apiece; which is a good deal.  The description does not say what size the watches are and I found out they're huge.  I have a small wrist and normally wear children's watches; these are definitely too big for a child to wear.  The face and strap on these watches are huge and are really big on my wrist.  They did come with an extra pack of 10 batteries (although one got lost in transit) and each watch already had a battery in it.

For the price I think it's a good deal; just be aware of how big the watch is.