All good points, as i see it, it is more of what i can load as to what they sell in the store. There is a an advantage in that, i only need 10 shots, as to leaving a film in the camera for a period of time. As to how many films i use, may be more on the 120 than 35, i do seem to have a lot of 35 in the fridge.
Thankyou all, i will look in to bulk film, with the advantage of what you use to what i do not and leave in the camera. This is a good point.