evaporated cane juice can be different things. (at least IME, since i regularly order both from either the co-op or the bulk foods store). like others i prefer Rapadura to Sucanat, but i think they are much the same thing.
I buy Rapadura in 33 lbs bags from either the co-op route or the local health food store in bulk. i get a discount if i order the whole bag for myself. i dont use 33lbs very quickly- we are talking years. I store it, like my other staples, in 6 gallon food buckets with gamma lids.