We were over there for the last five days, just the two of us but was not too pricy, we only booked a few weeks ago, first time over in the jeep so no idea what to expect.
£138 return ferry (Jeep + 2 passengers, Portsmouth - Caen)
£110 camping (5 days @ Chateau near Bayeux)
No need to be in an organised group, we met tons of vehicle owners on our campsite and were in several convoys out and about and visited about 15 museums & beaches.
Used about 30 gallons of fuel, covered 400 miles, met lots of great people, the atmosphere is amazing.
One highlight was taking a USAF Brigadier General for a ride down the Coleville draw to Omaha and him insisting we drank Calvados on the beach with him.
Worst experience, Ohama cafe charging 5.5 EUR for a can of coke, decided we were not that thirsty.