I know this is a little bit jaggy, and shameless promotion, but thought it'd be of some use to the labels and the bands who come on here...

A crafts company I work for has just started stocking those Arigato Paks, and the cassette version - the Brad Pak, which makes it the easiest/ cheapest way of getting them in the UK without paying for US shipping/ customs/ all that other shit. Also has other packaging things which look well nice and I've used a fair bit of in the past for some satan/ Season related stuff.

http://fraugreen.net/music-packaging.html