Does anyone know the variety of these huge Sorrento lemons ?

OK, now I have to source one. Are these available in CA ?

Not sure if it's the same variety, but they appear to have it...

http://www.ranchodelsolorganics.com/default.html

Probably "just" feminello?

http://www.homecitrusgrowers.co.uk/citrusplaces/sorrento.html

They are not lemons, but citrons - Citrus medica.
'Cedri' is the Italian word for citrons.
However, I have never been sure exactly which variety these are - they are often sold from stalls around Naples/Pompei/Sorrento. They don't look like the commonest Diamante variety, but there are also several local citron/ lemon crosses known in Italy as 'Citrus limonemedica'. This is not generally an accepted botanical name.

Purchasing citrus at that stall would be a two in one. Enjoy the fruit and by the way here's some budwood if you want to graft or even root your own! Grazie mille!

What is the flavor ? Very much like a lemon ?

I think it is less acidic than lemon, maybe slightly more aromatic. It is used to make a drink, the famous "cedrata", and the skin is used for confectionery

Maybe ? Although not available...

http://www.citrusvariety.ucr.edu/citrus/sicily.html

I have something like this in my yard. The tree was here when I moved in, and all the previous owner could remember is that they were "Italian lemons". I know lemons well - we live in "lemon country" here in N. San Diego county, and I have NEVER seen lemons like mine until this thread! They are huge. Humongous. The poor tree needs to be staked up, and I have to do some serious pruning. It is hugely prolific (like lemons are here), and the lemons have this odd, thicker, lumpy skin exactly as the photo depicts. The lemons are seedless or nearly so. Can't say as it's any less acidic than, say, a Eureka (I am not a big sour citrus fan, so it's all sour to me), but they are SO distinctive looking. If I can snap a pic of my tree I will. It's squeezed next to a huge Pride of Madeira bush that I'm going to be trimming back, but hopefully I can snap some pics of the fruit next to my hand to show proportion. Fabulous. Good to know a bit more about my lemon tree.

Absolutely Patty, lets see some photos !

In the first pic one can see the new foliage growth, that is not of the tipical purple colour that distinguish lemons from other citrus - this should confirm that it is not a lemon but probably a citron.

About true Sorrento Lemon (Limone di Sorrento):
"...It is here that an ecotype of the Femminello Ovale variety gradually differentiated through time to form the present cultivar defined as the Ovale di Sorrento, Massese or Massalubrense lemon...
...The lemon is medium-large, elliptical, with an attractive lemon-yellow skin, very fragrant and with a particularly juicy and acidic flesh...."
http://tasteofsorrento.sorrentoinfo.com/prodotti/limone_sorrento_eng.asp

The area, Penisola Sorrentina:
"...There are two main varieties of lemons grown on the Sorrento Peninsula, which are also divided geographically to those grown around Sorrento and those grown on the Amalfi Coast. The Limone Costa d’Amalfi are the lemons grown along the Amalfi Coast, with are also called Sfusato Amalfitano after their elongated and pointed shape. On the Sorrento coastline you’ll find the Limone di Sorrento, which are rounder in shape than the lemons of the Amalfi Coast..."
http://www.charmingitaly.com/lemons-sorrento-amalfi-coast/

The lemons described in these articles are all Feminello derivatives, and are very definitely lemons. They are also described as being "medium-large, elliptical, with an attractive lemon-yellow skin".
The description applies to the lemons grown and sold in the Amalfi/Sorrento region but does not match the extremely large, pale-yellow fruit shown in the photo at the start of this thread. As said before, these are clearly citrons or citron hybrids.
In the link to my website page diven by MarcV ( http://www.homecitrusgrowers.co.uk/citrusplaces/sorrento.html) , I described them as 'huge Diamante citrons'. I no longer think they are Diamonte, which generally have a very distinctive square-shouldered shape.
Mike/Citrange