The article mentions his fart machine. A few years back I dug around, found them, and bought a couple. They are here:
Later on I was going to a family reunion with a lot of kids, so I wrote to ask if they sold in bulk. They said sure, but the minimum order was 50. That seemed like a lot, but it's probably one of the best purchases I've made. I've been giving them away for years, to the delight of some and the horror of others.
Highly recommended, and 100x better than a digital equivalent. Their analog nature means you can get a great variety of sounds out of them.