I sincerely hope that the price will come down on these devices so you can obtain one.
Your son will come to recognize the symptoms of low blood sugar. I get the shakes, like too much caffeine. So I keep a small sealed container of refined sugar in the car, within easy reach, just in case. Perhaps because I plan ahead to have my sugar up when driving, I've never used it.
An old friend and colleague who was type one told me 20 years ago that he used peanut butter as a "reserve" at night. Low glycemic index foods feed glucose in slowly, maintaining a safe level without provoking a "peak-and crash", he said. Happily I love Smucker's Natural, which has no added carbs.