There are already accounts in your life that are accumulating money that could be used toward investment in your business. Although it is usually frowned upon to touch these accounts, the money in your 401k, IRA, Securities, SEP, and life insurance policies are still yours and can be taken out if needed.
We recommend that before touching any of these special accounts, that you consult a professional. This can be your lawyer, accountant, tax or bank advisor. They will help you to decide which accounts to dip into to avoid the largest penalties or consequences and help set you up on a financial path that helps finance your new business.