“The price gouging is on matza”
not sure whether you mean in the supermarkets or in the local jewish groceries.
I did not do a survey, but in the kollel gorcery in boro park,
the price for at least one brand of hand shmura is the same or less than you pay at the bakery.
in Shoprite all passover items including hand shmura are way more than in the jewish stores.
this is especially true of the “heimish” brands.
the supermarkets sometimes do give deals and low prices on standard machine matzoh brands. but everything else is shockingly high. oh and there may be sales on kedem grape juice. those two items are about it.