Have these spacers with the mouthpieces been discontinued? I went to the chemist today to pick up a prescription and he gave me the one with the mask (which I hate using). I asked him for the mouthpiece and he said they don't make them anymore. Is this true and if so why have they stopped making something which is really useful. I know it sounds stupid but the one with the mask is fine for using at home but when you're out and about I would rather have the mouthpiece one as it fits in my bag easily.