Your best sources of financing could be right under your nose: friends and family. Even if they don't have extra money sitting around, there are still ways they can help you finance your invention.
For one, they can cosign a loan for you at their bank. Other tactics: Have the friend or relative borrow money from his or her life-insurance policy. And if a person owns stock, he or she may be able to borrow money using that stock as collateral.
You'll be responsible for the monthly loan payments, since the loan is in your name. But your relatives and friends are still on the hook, since they cosigned the loan. Nonetheless, such techniques allow them to help you even if they can't come up with ready cash.
Mike Mogadam, c/o Barmate Corp., (415) 543-7747, http://www.barmate.com