Pedometer for kids?

The Garmin Vivofit Jr is kind of pricey, but it's the first I've seen aimed at kids. My co-worker's 10 year old daughter seemed to do well with a Fitbit Alta. My 8 year old stepson wears one of my old Fitbit flexes sometimes. For the most part, every young person I've given a Fitbit to seems to wear it for about a week, then gets bored and takes it off.

This one from Unicef turns your kid's steps into funding for malnourished children. You can buy it at Target, but not sure how much.

http://unicefkidpower.org/about/#.WGurBvkrLcs

I found a $30 one at Marshalls. My 8yo son is happy with it and loves tracking his steps daily.

I have this.
Ozeri 4x3motion Digital Pocket 3D Pedometer with Tri-Axis Technology
It works for counting steps and is not expensive.