Dimethicone Where To Buy Dimethicone For Lotions?

Where to buy Dimethicone for lotions? - dimethicone

I am eager to start, creams and soaps. My question is: where do I find all the ingredients I need, I have some scented oils, but I can not find alias Dimethicone polydimethylsiloxane. I know it is used in many cosmetics, but where can I buy?