Thin cable lock for bike (Spring Hill, Somerville)

I'm hoping to get a thin cable lock for my daughter's bike -- she has trouble wrestling with the thicker, stiffer cable lock she currently has. I know cable locks are easy to cut, but I'm not *too* worried about someone going after a kid's bike. Looking to get one with a combination rather than a key, because I don't think she can keep track of a key yet. :-)