Amazon offers its Prime members Chitty Chitty Bang Bang on Blu-ray / DVD Combo
with free shipping
. (Non-members can spend $25 or more to get free shipping; otherwise it adds $2.98.) That's the lowest total price we could find by $10. This 2-disc set comes with a DVD and Blu-ray disc.
Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months.
Update: The price has since increased slightly to $10.49.