Convenience and laziness come at a high price. I will never get over people buying frozen peanut butter and jelly sandwiches (roughly $1.00 per sandwich). 200 calories each for these measly 2 ounce sandwiches.
At most a tablespoon of peanut butter (95 calories per Tbsp), another of jelly (50 calories per Tbsp), plus the 65-ish calories for the total of two small slices of crappy white bread without crust.
A loaf of Walmart's white bread is $1.42 for 22 slices so 11 sandwiches, so 13¢ per sandwich.
A 40 oz jar of Jif PB, $5.48, contains 68 Tbsp, so 8¢ per sandwich.
A 30 oz jar of Welch's Concord Grape Jelly, $2.97, contains 42 Tbsp, so 7¢ per sandwich.
Total: 28¢ per sandwich rather than $1.00. Only thing that needs refrigeration is the jelly. And it takes literally under a minute to put together a PB & J sandwich.