Where to buy cork floor tiles?

We're putting new flooring down in our hall and living room and were considering cork tiles. We already have cork tiles in our attic and box room and they work very well.

But they're the bog standard tile (think notice-board type cork) and I'd like to find ones that are a bit more interesting (but not crazy expensive). It seems, however, that even the bog standard ones are hard to source.

Has anyone any suggestions of where to get cork tiles, preferably sealed and more interesting than the bog standard type?