I love the idea of personalized Valentines Cards for kids !
Vistaprint  gives you a great chance to get 30 of them for FREE (of course shipping is $4.80- usually it takes about 10 days).
You can add different pictures to all three designs and customize what each one says.
Plus the Valentines are dropped off on your front door step.
I would order today or tomorrow to ensure they arrive in time!