US households have spent much of this year waiting for the other shoe to drop. After the US and Israel's war with Iran sent the oil market reeling, starting in late February, it seemed that grocery bills would not be too far behind. Transportation costs have risen for many businesses, and some supplies, such as the fertilizer farmers need to grow produce, have been disrupted. But while gas prices have slammed drivers' wallets in the last few months, the cost of many staples at Costco has hardly