To search for and buy, online, IGM95 gridded data, go to the Geo products page and click on the following options from the left menu:

• Elementi Geodetici - grigliati, and then select the option you are interested in among the four listed below (GK1 point, GK2 point, GK1 sheet, GK2 sheet)
  

Grigliato GK1 (300 km2): it covers 10 km around each IGM95 point, ITALGEO99 geoid reference
Grigliato GK2 (300 km2): it covers 10 km around each IGM95 point, ITALGEO2005 geoid reference
Grigliato GK1 (600 km2): it covers each sheet of the map of Italy at scale 1:50.000, ITALGEO99 geoid reference
Grigliato GK2 (600 km2): it covers each sheet of the map of Italy at scale 1:50.000, ITALGEO2005 geoid reference