That is a great story. I have told the story of how I got my first detector before; but I will tell it to you.
I had gotten a copy of Western and Eastern Treasures magazine. I had seen the ads for the White's Eagle II, and I was in love with that machine. My father at this period would normally spend an indeterminate and variable number of days holed up in his bedroom with cases of bottles of whiskey, his precious gun collection, and lots of pr0n. Sometimes he would come out to have a psychotic episode and give me a beating or teach me the more intimate knowledges of the gun. One day he was in a complete psychotic stupor, and I managed to somehow talk him into going to Sears to order a White's Eagle on the credit card in order to get away from "the collection agents that were crawling in through the windows with guns."
The good people of Sears took the card, and my White's Eagle II arrived shortly thereafter and I began my life underground. The old man gave me a beating, but that was the norm so it was nothing approaching punishment, it was merely daily life.
The point to this story is not to make you feel bad for me, but to give you a good hearty and toothsome real world example to use for compare and contrast purposes. The point of this story is to make you feel good about yourself and being a dad.
Now, please pull some psycho stuff to scare the kid before he becomes too spoiled. Also, start saving now for the eventual upgrades and different coils as he becomes overwhelmed by enthusiasm.