It is more expensive than regular housing; higher loan rates & almost always a couple of points in fees (each point = 1% of the loan value). The last one I sold was a few years ago, and it was ~ 8.5% loan rate and 3-5 points.
Your best bet is to check with agents specializing in mobile home sales, or escrow companies that process these sales. Also, be aware than some mobile homes can be registered with the DMV as vehicles, with different tax rates, while others are considered real property. It also depends on whether you own/lease the land, too.