I am afraid this is another cost to the aircraft owner brought about by Part M.
As has been said, the CAMO has to have up to date manuals for all the types it has on its approval, all the time.
Technically we cannot borrow the manuals from another company for the time we are doing the job. Cessna manuals on CD are extortionate because of copyrite etc. A CD from avantext with the 182 on it is over $2000. Granted there are a host of other types on it but if its just 182's you need you cannot justify it for one aircraft.