The Corn Gift Set (“Tomorokoshi Gift Set” in Japanese) does differ from Mei’s present in that it doesn’t contain any actual produce.
Alternatively, the Corn Gift Set is available for purchase right now through the Donguri Kyowakoku online store here, but with May 8, Mother’s Day, as the only selectable delivery date.
Though she doesn’t have very much screentime, the mother in My Neighbor Totoro is a major presence throughout the anime classic.
Instead, it’s a bundle of two adorable household items with gift-wrapping that looks like an ear of corn rustically still in its husk.