Kites are wonderful toys. One of the most popular party favors I ever gave out were the $1 kites I found at Target. Didn’t include much else for party favors, and the kids were still just in awe. The kites flew pretty decently for $1 kites, too.
Spend a little more, and your kids can have much nicer kites.
The hardest part sometimes is finding a good place for the kids to fly them. I always have to remind my kids that they cannot let their kites go over the street if they can help it when they take their kites to their favorite spot. Way too dangerous with cars driving by. Parks are a better place, so long as there’s a big, tree-free area.