Sure. I know many rehabbers who have put together groups of investors.
Before we get to investors, though, you may also want to consider hard money lenders. These are companies (or groups of individuals) who lend based on the equity in the property, rather than on your credit rating or income. The general structure--and it varies a bit in different parts of the country--is that a hard money lender will provide up to 65%-70% of a property's ARV (after repair value) minus any rehab costs. So, consider a house that, after rehabbing, would sell for $500,000. Assume it needs $40,000 in repairs and upgrades. A hard money lender would lend 65%-70% of $500,000 ($325,000-$350,000) minus the $40,000 in rehab costs...or a total of $285,000-$310,000. The going rate for hard money also varies, but is usually in the range of 5 points plus 12% interest. You can get set up with a hard money lender in a few days.
Investors generally will want a 12%-15% return, but won't ask for points. However, different ones will have different criteria about how much they'll lend, for how long, and whether they want to be in first position.
To find investors, make your needs know at your local real estate investment clubs. Here's a link to the ones in California: http://www.creonline.com/real-estate-clubs/ca.html.
Attend a few meetings--it'll also give you a lot of good information about real estate investing in general. But most also have an agenda item at the beginning of the meeting for announcements or requests. You'll get plenty of interest.
Another suggestion: As you drive around, look for the "We Buy Houses" signs--often called "bandit signs," they may be put on stakes at intersections or nailed onto trees or telephone poles. In a way, they're your competitors, but they're also your teammates. Talk and network to those people. They'll have sources of money they're using for their purchases.
Slightly longer term, if you can network with groups or individuals who have ample retirement accounts, those are great sources. Some may already have self-directed IRAs. If not, it's easy enough to set one up and transfer funds from another retirement account into a self-directed one. That allows those people to invest that money into your projects. And the groups don't have to be rich. Yes, doctors and dentists are a great source. But I know one investor, a county policeman, who has raised more than $4 million from his fellow officers.
So, that's how you do it.