Buy the dip! Your guacamole for Super Bowl Sunday is the cheapest it’s been in decades — and chip prices are down, too.

Myra P. Saefong, assistant global markets editor, has covered the commodities sector for MarketWatch for 20 years. She has spent the bulk of her years at the company writing the daily Futures Movers and Metals Stocks columns and has been writing the weekly Commodities Corner column since 2005.