Hmmm...

Ten bucks? Oops ten plus tax which is just about right here in California at the moment.

If it were for the kid, I'd try to find a Gerber LST knife for that much, I know I can get a Paraframe Jr. for $12.95 but that's over your limit.

For me, maybe an extra firesteel? Or another 4 way faucet wrench so I can keep one in the car and one in my urban EDC kit?

That's a tough one.