[Blitzwing85]

Like MissMisa said, this sort of thing is actually popular in Japan.
I was just on a website yesturday that offers this kind of service where people like yourself can join and that way you will get more custom as it's through an official channel.

I can't recall the name, but i can try and find it again.

Basically people will list certain things they want and people like yourself can take a photo in a shop of the item and the price and post it on the website. Then somebody might ask you to buy it for them and obviously pay you a bit extra.