It isn`t that hard to get compost material, I don`t use grass or weeds but use 1/3 cardboard shreds, courgette plants, cabbage bits etc It all adds up and we peel and eat a lot of veg in our house. I don`t compost allium parts or potato roots but all my potato tops went in, they were blight free. Add the bean plants, comfrey, old marigolds etc and you soon get there