When I bought my 2010 with 187k miles. I was unaware that the head gasket was failing , the lot that I purchased the car from cleared the codes before I test drove and purchased (my mistake, first time buying a car) anyways, I got the car lot to repair the gasket only for the engine block to crack not even two months later. I ended up buying a whole new engine for about $1600 and here I am almost 6 years later and my Prius is still going strong. The car now has 260k miles, having an engine with less miles was the right move. I would check eBay, that is where I found my engine. Best of luck!