This is a broad-based survey from MLS that shows the data as of each 1st, 7th, 14th, 21st & 28th (Usually posts the day after each reporting period).
The sales numbers are right off the current listings service. Keep in mind that other reports document that sales prices vs. listing prices are 95-96%, but this is a weekly report that shows “current trends” with both “Supply” (# of houses for sale) and mean pricing.
Prices are declining about 1.5-2.0% per month in San Diego since August. This report shows that statistic. Ultimately, the sales numbers reported by Data Quick and others will follow, but there is about a 5 month lag because you have “days on market” + “time in escrow” and then you have a closed sale.
Make a chart with the weekly/monthly sales numbers from this web site. Make a 2nd chart of numbers from Data Quick and Sandicor but a time frame of 5 months later and you will see the connection.
In the coming five months data will come forth (from DataQuick) that will show a 6-9% decline (or about 1.5-2.0% per month)