Andrew,
Here are some reimbursement pathways from Abbott for its products, which I believe includes Juven. I received Glucerna, 8 cases, for free, through medicare during treatment with the help of the centers cancer dietician being I was deemed "tube dependant." Another way may be for weight gain for cacheixia or its prevention, even if no tube is used, but I haven't looked into that. There may be other private insurers that have similar discounts, and or coupons mentioned. I haven't read it's entirety, but Abbott may offer a patient discount for those underinsured or on financial need basis.
http://abbottnutrition.com/reimbursement/pathway