The Sound of Music: 3-Disc 45th Anniversary (Blu-ray/DVD) for $9.96.  Shipping is free on orders over $35.  If needed, use this Filler Tool to qualify for free shipping.  Here is a screenshot for your reference.  Alternatively, it is available at Walmart in 2-Disc for $9.96 with in-store pickup.  Most places have it for about $17.