Infocasa site is not ment for the public, just so happens that you can use the most up to date engine, to much publicity and they will probably password it for agents only.
Kyero is pants! helps nobody, although its research re data can be helpfull, see Marks Intelligence/News
Fotocasa is ok, agent and private ads, Spanish site.
Sorry, I have no knowledge of prices other than CDS
If you want to keep up to date with the most recent listings/reductions
go to the link I posted and check every day, about 10-15 per day.