Someone a few pages back was looking for kawaii stationary. Artbox are both online and have shops in London and Brighton, their stuff isn’t bargainous, it’s the real deal brands imported from Japan and Korea not just kawaii style, but they have a good selection. Paperchase often do kawaii style stationery too.
On Amazon they usually have books on how to draw kawaii style, I got my DD one a couple of years ago and she still goes back to it for inspiration frequently. She started secondary school in September and was very miffed her art teacher told her kawaii wasn’t a proper art style.