Is there a way to find someone to be a co-signer if you have no other option?

As a sort of continuation to keshlam's excelent answer, don't get involved with anyone who offers to be a co-signer.

If no one you know is willing or able to be your co-signer, then you certainly shouldn't trust any random person on the internet who offers to be a co-signer. As you suggest in your question, anyone reasonable who saw such a request would feel wary... implying that anyone who did respond with an offer of help is almost guaranteed to be scammer trying to take advantage of your situation.

Simple answer: not if you have to ask us. Nobody should ever co-sign a loan; it is safer to just lend the individual the money, and if you aren't willing to do that you shouldn't consider co-signing either.

If you can't find somebody who trust you that much, find a way to do without that money. Look for alternatives that are cheaper, or look for ways to save up for whatever it is, or consider whether you can do without it. Or some combination of the above.

See past questions about co-signing for details on what's really involved and how badly it can go wrong.

Frame Challenge: Trying to Solve the Wrong Problem

You are in need of money not in need of a co-signer for a loan. You have already exhausted your own credit worthiness, and cosigning on loans is a fast way to destroy relationships that could have been useful for moral support and encouragement while getting through a difficult time.

Alternatives

In this scenario going further into debt will only snowball the compounding damage of interest making the long term situation worse. As such you need solutions that do not add to the existing debt problem.

Local Community Services and Charity

There are charities, churches, non profit organizations, local government services, and more that seek to help people who are struggling with various situations. For those in legitimate dire need they can step up and provide some small aid that can get one through a tough period. The services that are available can vary wildly from one location to the next (along with the process to access said services), so reaching out and connecting with people who volunteer or work in these areas can help discover other groups that can help, and they can help guide you through the various forms or websites you have to use to get it.

Financial Auditing

There are people who have plenty of income, but are not tracking their expenses which has resulted in them going into high levels of debt. There are many methods out there for tracking expenses and auditing one's finances to figure out where the money is going and clamp it down to being within a budget. A solid budget can stop the debt hemorrhaging and get back onto solid footing.

Final Thoughts

What is your exit plan? If someone waved a wand and you had all the money you needed to meet your expenses for the next 6 months, what is your plan for after those 6 months are over? People and organizations will only offer so much aid and help before cutting one off. Before that happens it is critical to have some kind of actionable plan to get into a sustainable financial situation and use what limited time you have to implement it.

Ditto to keshlam. Let me add:

Co-signing a loan put the co-signer at considerable risk. There's no clear benefit. A friend or relative might cosign out of love. I once co-signed for a loan for my sister. But I can't imagine a reason to co-sign for a stranger. I suppose you could pay them to co-sign. But if they charged a reasonable amount, why wouldn't the bank just charge the same reasonable amount? Maybe you could find someone akin to a loan shark, someone who will cosign for you for money and if you don't make the payments they break your legs. i.e. they insist on the kind of insurance that a legitimate bank could not demand.

As keshlam says, if the bank demands a cosigner, that presumably means that they think you're borrowing more than you can afford, or you don't have a good track record of repaying debts. Either find a cheaper house or car or whatever you're trying to buy, and/or improve your credit rating by paying your debts promptly.

Other people have pointed this out, but being a co-signer is a terrible idea for numerous reasons. There is no advantage for the co-signer, only risks and downsides.

The lender is clearly not fully convinced that you're able to repay this loan (which is why they're insisting on a co-signer). The fact that you're asking this question suggests that most people you know aren't convinced either (or that the ones who are have similar financial issues to you).

In most cases where lenders are not convinced of your ability to repay, that's either because your income is too low (or too sporadic), you have a history of not repaying debt, or you're already in too much debt. Neither borrowing more money nor finding a co-signer will address any of those issues.

I would encourage you to look at what about your financial situation brought you to this point and try to address them.

No, there is not.

Don't ask for a co-signer on the internet. This will attract a horde of scammers, targeting you.

Don't accept a co-signer from the internet. Ditto.

All that said, see "loan protection insurance". It's a relatively unused option that sometimes can replace the co-signer, because it does the exact same effect of a co-signer.