It's been said that potatoes and onions are the nuts and bolts of the produce department. Looking at prices at Walmart, these two core commodities have seen price spikes from mid-January to mid-April.
Russet potatoes, per pound
Jan. 16 price: $0.74
April 17 price: $.095
Percent increase: 28%
Yellow onions, each
Jan. 16 price: $0.81
April 17 price: $0.95
Percent increase: 17%