My totally unsubstantiated theory on why the lowest-priced dump in some areas have edged up a little is also that there is still a healthy supply of GFs driven by bossy spouses trying to get in before school starts. Not as many people have a loved one clamoring to commit their life savings to an IB or Mira Mesa fixer.
But I know there are probably FSBOs out there that are less. We picked up a flyer from a FSBO in Encinitas in May that was $620K. Just recently I ran across it on Zip and it was priced at $670K — as if raising the price to cover the Realtor fees would sell it. Duh.