The DU Lounge

In the store. I hear it's good if you stay in the aisles along the walls, avoiding processed foods.
If I buy meat, I buy family packs, repackage into meal size and freeze. When I do ground beef, I flatten the pack, so it takes less room in the freezer. I cut chicken breasts into chunks, and divide into meals to freeze. I can make anything from soup to stir fry. I flatten those packs, too.
If you have room for storage, dried beans, rice, and root vegetables store well in a cool, dry place. I put a small shelf in the spare room, and use it as a pantry.
Instead of deli chicken, I'll get a can of chicken. I can add the broth to soup I usually make about 2 qts of soup, and don't add salt, so with other liquid, it is salty usually enough, but not horrible. (You can try to get reduced salt, or discard the broth) I use the chicken to make creamed chicken, over mashed potatoes, or homemade biscuits. I can divide the can and get a small chicken sandwich, too.
Anything I make with meat is usually a casserole. I keep frozen mixed vegs and California blend handy. Easy way to make stir fry or soup.
I bought bouillon cubes to use rather than cans of broth. They last awhile and don't take much space.
I look at the bargain stores for deals on food. Recently got dry spinach/cheese tortellini 3 servings, 1.25. I will get 4 decent meals out of it.
If you have room on a window sill, you can try growing some herbs. A tip I picked up was putting a green onion root/bulb in a small bit of water, and it'll grow, just enough for a garnish
If you have friends or neighbors, you might try sharing a bag of pototoes, or other bulk items. 5lbs takes less room and eadier to use.