But if the Klingon dictionary alone is not good enough for you, you’ll want to get yourself a Klingon keyboard from Cherry (UK).
Or maybe even better just run out and buy yourself a USB keyboard, pop the keys off, and redo them in a Klingon font. Then plug it in and turn on the Klingon font on your PC and away you go. Much cheaper and maybe even more fun. Heck there has to be a site out there somewhere where you could get custom keyboard stickers if you wanted them.
You’ll find a DIY Klingon Keyboard much more satisfying than buying one (especially one that isn’t even an official Star Trek item).