Your best source for rentals will be craigslist SLO. Alex has a very good post as well.
If you have some cash to put down (3.5%) on a home, you may be better off buying a home instead of renting. There are homes available and prices and interest rates are still historically low. Your loan payment could be as low as $1000.00 per month, compared to rentals that average $1,600.00 a month.
Please contact me if you would like help finding a home or go to my web site to view homes in real time. http://www.dnorwood.com/Pages/SLO.aspx
David Norwood - Central Coast Real Estate - David@DNorwood.com 805-471-0828