The list author says: "Going to a lot of kids' birthday parties, I am constantly on the lookout for inexpensive gifts for the birthday boy/girl. I like to have them in advance, so I'm not out desperately looking for a gift the day of the party. I also tend to buy unisex gifts, so that they are suitable for a boy or girl."
"Granted, a bit more than the $10 cut-off, but perhaps THE best game for all ages, when you just have 5 minutes. Seriously, in the morning, while waiting for school to start, kids are crowding around, watching. And adults can't resist it either."