There are a few Ghibli Blu-ray/DVD combos on Amazon hovering around $12. This seems to be pretty normal sale price these days. There was a thread about a month ago for similar prices.
My Neighbor Totoro: $11.99 https://www.amazon.com/Neighbor-T…00BEYYEJ4/
Nausicaä of the Valley of the Wind: $11.45 https://www.amazon.com/Nausicaä-…004CRR9G0/
Howl’s Moving Castle: $12.07 https://www.amazon.com/Howls-Movi…00BEYYEI