Hi Don,
Classique Automobiles and Klassik Auto lloks to have some nice features onces in a while. I do not collect them, so I am not totally sure, but I know what they look like...
The owners club magazines from USA and Holland have good photos, at least in my opinion. Beauty is in the eye of the beholder and therefore I can't say a full yes or no. The most fun about those magazines is the fact they all show pictures of club events you won't find elsewehere. If you are looking for 'poster' shots, you might want to have a look at World in Red or even Ferrari Story.
DaCorsa is currently under construction, since the webmaster wants to move the site to another domain and he is also restructuring the complete site. Most of the magazines shown there, I can comment on and even supply them if you want to: I then will keep an eye open for them.
The Auto Prestige Ferrari Models series are provided by Dirk (DJ Dirk on thos forum) so he can give you more info on them. I think they are widely available but since I limit myself to the Dutch and English language, I do not know all the details.
Yes, Autonet from Rotterdam is located right around the corner from me, so I will be there quite often. They have a good stock of magazines, but this depends on what customers consign there! The price of Cavallino are a bit high, but for the others it is quit okay. Any other shops: depends on what you looking for. I know quite a lot in Britain, the Netherlands and some in the US where I bought from. will supply websites if you are interested.
I have never been to the Retromobile show in Paris, so I can't comment on that either. Dirk will probably know!
Hope it helps a bit.
Niels