The 500g bags are as cheap as I have seen thus far, and she also sells smaller quantities for those who, like me, appreciate minimalism.
As to my own experiences, I have not suffered leaky gut so I cannot offer specific testimony. I do believe that it is, by far, the most profound of healing modalities when dealing with any kind of digestive disturbance, and should perhaps be one of the very first protocols to follow when on a healing path. I wish I had known about it one, two, or perhaps even more years ago.
I read only a few days ago of the possibility of adding a touch of maple syrup to make it more palatable, without affecting the results - I shall try this over the coming days. The gruel is hardly the most delightful of foods so perhaps this is an option to ease the whole process.