Question:
Is it permissible to do grocery shopping on chol hamoed?? even if it is for after the holiday ??
Answer:
One should not buy groceries on chol hamoed if the items are for after Yom Tov, unless there is a chance that the items will not be available afterwards or that they will be more expensive later.
Sources:
O:CH 533:1 & 3 Mishnah Berurah 16 & !7