The California Association of Realtors released their median home price comparisons for the state today. They have SLO County median home price dropping 18.7% from June to July which shows that you have to take month-to-month data comparisons with a grain of salt. With the lower number of Sales we're having in a month, it doesn't take too many high-end or low-end sales to make a big change in the numbers. That's why I do quarterly reports for median home price comparisons.

Plenty of data here