Here's an old secret kitchen recipe by the General's grandma : :-)

Save money by re-using old silicone molds.
You can save quite a few bucks by re-using old molds. Silicone sticks well to silicone. You can cut/grind/chop old molds to pieces and mix them into your new mold mixture.
Make sure your master model is properly covered in fresh silicone first, though. Then you can poor in the rest of fresh silicone mixed with the cuts of the old one. How small do you need to cut these pieces ? The finer, the better. ...

Good appetite !