After the floods here in Oz tomatoes are about $5/lb and lettuces $10 each....prices coming down now.
But my "survival" sandwich when at Uni many years ago was peanut butter on one slice, vegemite on the other (both buttered; no margarine), tomato and cheddar cheese sliced THICK in the middle.
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Salt and pepper with fresh onion slices if I thought of it at the time. Was meals towards the end of the week after the "fridge raid" at home on the weekends ran out. (Mum would cook all week so that we at Uni could fill up).
Very fond memories and frankly NOTHING without the tomato!!!
Greg