The two best
sources in print are the PCA Magazine Panorama and the Porsche
Market Letter (PML).
To get Panorama you must be a
Porsche Club of America (PCA) member. You may have a friend in
the PCA who can loan you a back-issue which gives the "Market
Watch" for the models in which you're interested. They rotate
different models through each issue, so you have to find the
right one.
The PML is subscription-based.
See http://www.pmletter.com/
I believe their September issue specializes in the 356. Like
the Market Watch in Panorama, they list trends in prices as well
as samples. You have to subscribe for a year, but as your search
for a car might take that long, it's also a good source of classifieds,
as is Panorama.
There's also the National Automobile
Dealers' Association (NADA) book of used car prices. See http://www.nada.com Note that
I found in my search last year that their prices tend to be lower
than the actual market by 10-20%; much more on the rarer cars,
like the Speedster.
Finally, I have to put in a plug
for the 356 Registry. You're not going to find a better source
of information on the Porsche 356. The cost of membership gives
you a superb magazine of which the ads are worth the full price
alone. I've been a member two years and I'd wished I'd joined
10 years before I bought my 356. I was a member for a year before
I bought my car and in that year I'd learned more about what
makes a good 356 for purchase in the previous 20 years I'd been
wanting one from a distance.
Good luck with your search for
your own Porsche 356!
Technical advice given on
these pages is provided free and without warranty. The user of
information presented on these pages assumes all responsibility
and liability in its use. We're not lawyers, we're car folk,
just sharing our experience. Be careful, use your head, have
fun.