Been looking for ages for something like this, these guys post all over the world and it's soo cheap! They are called SantaMail and they write your child a personalised letter thats signed by santa, stamped in the north pole and all sorts of things!
Last year my sister made one like this, took her ages, but the kids loved it so much, i dont have that kind of time, so this website will make our kids smile this year, and i wont have to lift a finger!!
SantaMail.com.au - Letters From Santa
My wife and i just ordered for our 2 children, so its safe to say they are secure, they use PayPal, visa & mastercard. And we got a reciept with in 1 min of ordering, to confirm our payment was successful and secure.
I hope this website can put some smiled of your childrens faces too!
Merry Christmas all!