especially given the time of year, weather, etc. Plus the sellers seem to be asking a premium for low mileage cars when those may not be the best cars having sat around most of their life. I like a 6k/yr car that has been very well maintained and the seller motivated by some life event. These aren't collector cars and probably never will be...too many made.
Use one of the craigslist crawlers and look around.
http://www.rideslist.com/ is an example of one that enables you to list boxsters say in any of several dozen markets.
Take your time, know the market, drive several, pounce on the right deal. Good luck.