I don't know if anyone has thought of this, but I was reading somewhere that those rubber gaskets people use for fans to stop the vibration noise were made of silicon or a similar substance.
I figured make some sore of mold for them and add silicon to the mold, let it set and you have your own rubber gaskets for the price of a tube of silicon.
I was just wondering if anyone else had thought of this and tried it. As where I am to buy the gaskets for the fans I have in my case would cost about $50 for them all.