I saw these huge boxes of goldfish crackers (cheddar cheese or something) and I'm pretty sure it's from the US at 360, so if it's the same thing, your son is set. I'll have a look and confirm the name next time I go.
Yes, they're Pepperidge Farm goldfish in cheddar flavour in the 58 oz size. The price was good too. The regular size and other flavours are available in the supermarket.