There are certain things I WONT bring into my home on pesach, not as a chashash of Chometz, rather that it “wont seem like Pesach”if I have it (Pesach Mustard is but one example).
The choices of products are seemingly endless, and anything that brings you simchas yom tov should be bought and enjoyed.
(I too have a child who has an allergy, to corn, so certain products, like Ketchup, i stock up on since it is made with sugar for Pesach).