Where to Buy a Rear Glass Cover for the iPhone 4 from?

Question

Hi,
I really need some help, please. My nephew, who lives outside North America, in a country where is no Apple Store, has an iPhone 4 phone that I bought for him in Canada. He now tells me that, by some accident (he dropped the phone on a hardwood floor from about a foot high!), he got a crack in the glass on the rear panel. The back panel is very simple to replace but where could I buy an _original Apple_ rear panel from (not a Chinese, etc. copy that might not fit that well) to send it to him?
I went to an Apple Store, here in Canada, and was told that they don't sell parts and don't do such repairs to the iPhone 4, just exchanges for a fee due to accidental damage (but then the phone is overseas and not easy to have it shipped here).
Please help! Where could I buy the original part from?
Thank you, you could really make a kid happy!...

Answer 1

Well, I did go this evening to the Apple store in the Yorkdale Mall (in Toronto). I spoke to a blue T-shirt guy (salesperson, not Genius) and he claimed he even double-checked with his manager. I was told that:
1. They do not care spare parts, nor can they repair iPhones or sell parts to customers; and
2. I would have to bring the phone in (very difficult, as the phone is overseas) and they will exchange it with another phone for a fee.
Do you have any official document that states that Apple would replace the back cover for $29? Is that valid in the US? Could a different policy apply in Canada? Thanks.