Simple, find out the cost and give him the cash, plus the link. He'll get what he wants, you give him a gift.
I still would not order from the US. Apart from the ever-changing CBSA rules, there's the risk of getting screwed by the seller.
I'd give him the address of ASC, tell him to get an account, verified, etc, and then he can buy pretty much what he wants. He can also buy more stuff later. And you dont get into any problems at all.