Yeah, having to buy and ship nutes to northern location is a major pain and expense. I think that if I was as remote as you are, I'd likely stick to making my own organic super soils as it would save a lot of expense and hassle in the long run (while also providing delicious, organically grown medicine
) Shipping nutrients just seems like a silly and unnecessary expense considering you are mostly paying for water-weight to be shipped across the country. Another option would be dry powdered nutrients, they would save you a ton in shipping....ever try any of those? I've used the GH Maxi Series powdered nutes in a Lucas Formula grow with great results. They are really cheap and a pouch of powder goes a looooooong way.