I'm not sure if anyone knows the series, but it's been popular here in my Country when I'm still a growing kid and up until now some of the local channels are still airing the show! Anyway the iPhone cover can be ordered here and is priced at 2480 yen or $31.12.
Checking out other iPhone Covers where you can design your own case it seems that this Doraemon Door Cover is priced competitively (see here). So What do you think? Are you getting this Doraemon iPhone cover? IMO I think this one would sell well if they accompany it with a Doraemon App :)