I bought this stuff at Walmart. It's a mix between slime and putty. They were a dollar each, and let me tell you they were worth it! 
These little jars of putty make farting noises when you shove them into the jar fast, but not only that, they entertained my kids for 2+ hours! It's great stuff!
I am totally going to have to get that! I would pay triple for anything that can entertain kids for that long.
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