Nature Baby have some as well, possibly the same ones.
Don't know where you are but the best (and cheapest) ones I've seen were made by a guy who goes to a bunch of the markets in Auckland and further north, we saw him in Paihia but he apparently goes to the Titirangi and Coatesville markets as well (plus some others which I forget, sorry), I'm planning to make a special trip to one of those markets just to get a set (we didn't have any cash when we stumbled across him ).