I would suggest going to a big chain book store (B&N, Borders) in person and looking through their store-brand card trick books.
These are meant for younger audiences, and focus on creating magic with a minimal number of sleights. Sometimes zero. If you have access to a few dollars for one of these, then it might be a lot better material to teach to 10 year olds.
That focus on magic over sleights can also be fun for the rest of us, too. There are a lot of basic tricks in those that can be made better with a more in-depth knowledge of cards, but which aren't necessarily covered by the extreme/street/underground scenes.
Example: I went thumbing through one of my own store brand books just to make sure this wasn't offering any bad advice. It detailed a basic effect with a "triumph" style ending yet was reduced to one really, really simple sleight. It would be a lot cleaner if that sleight was replaced by one more "advanced" but hardly difficult move.
So you keep the harder version for yourself and teach the easy one to the kids. Or teach them an easier one.
Anyway, that's my thought.