[iamchmod]

Do you think this would be a good birthday present for 9 year old? Or is it too challenging for that age range?

[krallja]

I had a "150-in-One" breadboarding kit from Radio Shack when I was 9 years old and greatly enjoyed it. This seems similar, but using the monthly subscription model.

[linuxlizard]

Little Bits are very fun, very simple. littlebits.cc

[jhawk28]

You might want to start with Snap Circuits.