I bought a whole book of them a few trips to Japan back which I was working on with the forums, but got a bit distracted from. Should probably get back to it someday…
There were also books of kanji-only crosswords on the same shelves, but I didn’t buy one. Also, there’s Japanese crossword mobile apps you can download for free.
They’re a bit tricky, as a learner, because even once you’ve understood the clue, you still need to work out the answer they’re expecting.