You can get one for less than 5 bucks shipped, you can even get 2 for 7 dollars shipped. It'll take a while. All the cheap ones are gonna ship from asia. Look up Nano Glass Diffuser. These ones will work with diy yeast co2. I've done it before. Some people claim that diy yeast will not build enough preassure to work with a glass diffuser but i think they might have used bigger diffusers.