Shopping service from Japan??????

Anyone used one of the many shopping service from Japan that will help you buy stuff there and then ship it to you? Will they only get you stuff that you can provide a web link to? or can they actually get stuff for you from local shops?

Trying to get the Mr. Hobby special paint sets for the Yamato 2199 line but only manage to find one of the them online. Have not been able to find web links for the rest of them but I assume you can probably just walk into any large hobby shop in Japan and buy them (or they can order it for you).

The outfit I’m looking at is:

http://cathandsagent.com/