There are much cheaper models available in the UK. Inlander make a fridge freezer to work on 12v or 24v systems such as this one on ebay (I have one of these) ...
http://www.ebay.co.uk/itm/Inlander-12v-24v-Silver-Fridge-Freezer-Boat-Caravan-Motorhome-RIR99DW3-/281049370806?pt=UK_CarsParts_Vehicles_BoatEquipment_Accessories_SM&hash=item416fd910b6

Shoreline do a whole range of 12 / 24 volt frides, freezers, and fridge freezers. All compressor type so suitable for solar systems. Much cheaper than the units available in Spain .....
http://www.shoreline-marine.co.uk/

Waeco (Dometic group) also make 12v fridges/coolers which might be suitable ......
http://www.waeco.com/en/58.php

These could also be suitable alternatives. Whilst the Sundanzers work off solar, They are expensive and based in the USa so shipping will be very expensive.

John.