Reddit mentions of RWBY Volume 4 | Anime & Manga | NON-USA Format | Region B Import - Australia

Amazon UK is quite similar to Amazon US or Canada, you can get free shipping on any 'Prime' item (it will be marked as having 'Prime' shipping) if the order is over £10 for books or over £20 for any other items (blurays and dvds included) and it's the cost of the total order that needs to be over that price (so you could bundle a few things together and get free shipping). You don't need Prime in order to take advantage of this, see this page for more details.

With Amazon Prime you can get free shipping on an order of any amount (again as long as the item(s) are marked as having 'Prime' shipping), there is no minimum amount. You also get access to Amazon Video, a video streaming service similar to Netflix, which already has Volumes 1-3 of RWBY and presumably Volume 4 soon.

There's a 30-day free trial of Amazon Prime you can get and if you're currently a student (or have a school-related email address) you could get a 6-month free trial.

For some reason it looks like Volume 4 isn't up on UK Amazon yet but it'll probably be up there pretty soon so just keep checking back. It looks like a listing is up but they aren't taking orders just yet.

Now having said all that, anything ordered from Amazon.co.uk will usually come from some warehouse of theirs in the UK and not overseas/international (unless specifically stated otherwise). Shipping from Amazon (if not free) is usually pretty cheap, anywhere from £5 (or less) to around £12.

If you're fine with ordering directly from RT then that's fine, I just find ordering from there (from Canada) to be rather pricey. It might be a fair bit different ordering from the UK because they have a UK store, they don't have a Canadian store so I have to order internationally from the US store.

PS. This post turned into something much longer than I intended, I just wanted to give as much information as I could. Sorry about that. ;)