Got some stuff from White Canvas, looks like they're good for international orders, but the process is a little different than normal.
You first have to e-mail them with the item number (according to their catalog), or a link to the item in their online shop, along with your mailing address. They should reply back... first saying to wait a few days, and later
with a PayPay invoice (that is due a two days after they issue it). I also mentioned that I wanted to use EMS, not sure if they'll automatically use that if you don't specify. When you e-mail them anything though, even a question, they'll usually give you a small response the same day saying to wait a while for them to actually answer your question/get to your order. They probably only have one guy there who can understand English to any extent, and while he might not be fluent, you'll understand him and he'll understand you.
However, I will say that in both of my dealings with them, there's usually been a minor slip-up somewhere. They'll still get your stuff to you just fine (in both cases for me, at least), but the first time they sent me the wrong tracking number. The second (most recent), I sent my order to them, and after not hearing back from them for a while, I e-mailed them back asking what happened. They were on it immediately after that (and it was actually mailed that day), but I think they might be a little disorganized there. Your stuff will still get to you, though.
Also to note, in both my dealings with them, they've usually thrown in something extra. This time I got a few postcards, two Touhou ones and two Higanbana ones. Last time... before they had Paypal, they actually packed in a whole bunch of goodies (I think I got a bunch of Touhou cards and more than one doujin music CD)... but this was probably because since I mailed them a money order, I overpayed worrying about fluctuating exchange rates. Don't think they'll do that anymore, but eh. Since this is Paypal, though, the exchange rate tends to be close to real exchange rates (I think they converted 82 yen to the dollar at the time when the actual rate was just shy of 83), if I'm remembering my invoice correctly, but then the service fee for using Paypal (4%) is passed on to you. Guess it comes out even.
Here's their information page, read the bottom for international shipping procedures and their overseas order e-mail.
http://www.w-canvas.com/user_data/information.phpAs always, your experience may differ from mine.