Dvdplaza is a R4 online shopping mall. It also has a Pricecrawler so you can compare prices. There is also a forum section to get store opinions.
I have used all the stores listed and not had a problem with any of them, so i'd suggest going for the cheapest priced
You made a good choice with dvdorchard jamont. From memory, i think they have taken out best online R4 retailer for the last couple of years.
It's good to hear your friend received her DVD without any problems.