Cleaning up some old papers I came across my food shopping list for my AT hike. In it I compared Safeway against A&P, the two grocery stores in my home town. I had combined the effort of buying food along the way and having food boxes mailed to me "General Delivery."
Note, these are 1974 prices. I had estimated that my AT hike cost me about $2,000 back then and that included my gear. I had Mac and Cheese (29 cents) so often (and into my college years) that I still shy away from it today.
It would be interesting to compare prices today.