I got this from someone else:

I was walking around in a Target store, when I saw a Cashier hand this little boy some money back.
The boy couldn't have been more than 5 or 6 years old.
The Cashier said, "I'm sorry, but you don't have enough money to buy this doll."
Then the little boy turned to the old woman next to him: ''Granny,
are you sure I don't have enough money?''
The old lady replied: ''You know that you don't have enough money to buy this doll, my dear.''
Then she asked him to stay there for just 5 minutes while she went to look a round. She left quickly.
The little boy was still holding the doll in his hand.
Finally, I walked toward him and I asked him who he wished to give this doll to.
"It's the doll that my sister loved most and wanted so much for Christmas.
She was sure that Santa Claus would bring it to her."
I replied to him that maybe Santa Claus would bring it to her after all, and not to worry.
But he replied to me sadly. "No, Santa Claus can't bring it to her where she is now. I have to give the doll to my mommy so that she can give it to my sister when she goes there."
His eyes were so sad while saying this. "My Sister has gone to be with God. Daddy says that Mommy is going to see God very soon too, so I thought that she could take the doll with her to give it to my sister.''
My heart nearly stopped.
The little boy looked up at me and said: "I told daddy to tell mommy not to go yet. I need her to wait until I come back from the mall."
Then he showed me a very nice photo of him where he was laughing. He then told me "I want mommy to take my picture with her so she won't forget me."
"I love my mommy and I wish she doesn't have to leave me, but daddy says that she has to go to be with my little sister."
Then he looked again at the doll with sad eyes, very quietly.
I quickly reached for my wallet and said to the boy. "Suppose we check again, just in case you do have enough money for the doll?''
"OK" he said, "I hope I do have enough." I added some of my money to his with out him seeing and we started to count it. There was enough for the doll and even some spare money.
The little boy said: "Thank you God for giving me enough money!"
Then he looked at me and added, "I asked last night before I went to sleep for God to make sure I had enough money to buy this doll, so that mommy could give It to my sister. He heard me!''