I just questioned why a non resident would want or should be on padron and why padron needed to buy a car. I know that someone who is resident told to get a padron to buy a car but I understood that only an NIE was needed.
Suggest you e mail p-pservices@hotmail.com as they have a lot of experience dealing with paperwork for cars and help people buy cars.
http://www.p-pservices.com/
P&P services know all about cars
http://www.autoscout24.es/QuickSearch.aspx?msgid=13&msgtp=2&id=162797950
you can do a search on auto scout use "area de busqueda" limit to say 50kms and in CP put 30840 in PVP put max price you want to go to .
hope that helps
David