ReAgent, Amazon Stores and Mistral are some of shops where you can buy acetone. Orders can be made online or by visiting the nearest authorised dealer within your locality. Acetone is used as a denaturation agent in denatured alcohol.
2 Additional Answers
You can purchase Acetone anywhere they sell nail polish remover. In my experience I have bought acetone at Wal Mart, Walgreens, and even some grocery stores. Acetone is commonly used to remove nail polish.
You can purchase acetone at a beauty supply store for a reasonable amount. Or you can also find acetone at your local retail store. Depending on how much you need, it may be cheaper at the beauty supply store.