Another option would be to contact some garage companies (i've been past 1 in Pudsey on the main road but can't remember the name) - some of these remove old garages before erecting a new 1 so might have spare panels.
We had cromptons remove an existing garage before the put up the new one 4...
I had a new sectional detached garage built a couple of years ago and decided to board the inside out.
I used kingspan insulation on the roof, insulation sheeting on the insides of the metal doors and fitted moisture resistant chipboard on the walls.
This looked great but not there are signs of...
You guys over the water are very lucky having big garages - here in the UK we mainly have single car garages so space is tight (some new build houses have garages so narrow you can't get a car in?).
Mine is a prefab 24ft x 10ft which is slightly bigger than normal but still small - i can just...