Here are things my single son likes:
Big things (upstairs):
Duvets and covers. They sell European-style white quilted duvets in probably about 10 different weights, so you can get just the right thickness for how cold/warm your house is. They also sell nice sheet-weight envelope covers for them, so you can frequently wash the cover without having to wash the thick quilted part. (If you already have a standard size quilt that is a pain to wash, the covers will work on that, too.
Steel gardening bench (actually; these are usually in the aisles of the downstairs warehouse area): My DS lives in a studio, and his kitchen is tiny. He bought a sturdy gardening bench with drawers and an extra shelf, and he keeps his small appliances on it (coffeemaker, airfryer, etc.) to free up his countertop. Tidy and there is no need to worry about it getting damaged by heat.
POANG chair: if you are in the market for a low-priced easy chair, this is a good one. It works as a bounce-rocker, with bentwood legs and arms, with a high-backed padded cloth (or leather) sling seat that can easily be replaced if it wears out. The bent legs act as springs, so it is very comfortable.
Compact carts: these little rolling metal carts are great as nightstands or next to desks or to move cleaning supplies from room to room.
Little things we all love (these will be in the lower-floor housewares dept.):
-plastic storage baggies (great because there are 2 sizes in the boxes, and they have 2-gal ones; cheap, too.
-kitchen canisters, cheaper than you'll find anywhere else, and last for years
-suction dish brush; solid handle, suction cup base to keep your brush out of the sink, and it has a hard scrubbing edge on one side, about $2
-general kitchen gadgets, peelers, spatulas, spoons, scrubbers, etc. Very inexpensive and good quality.
-plain steel pans and salad bowls; inexpensive and really nice quality for the price.
-flexible cutting boards
-universal household scissors: work if you are left-handed, and only about $3
-plant pots; lots of variety at good prices
-tableware by the piece; great if you live alone and don't need full sets for 4
And some things that are sometimes upstairs and sometimes downstairs, depending on the store: small storage containers and miscellaneous hardware.
The zip-up framed cloth storage is really nice, inexpensive, and keeps out dust. Underbed size is great.
Lots of sizes and types of boxes to hold things like pens, small tools, etc.
Hooks: some that mount permanently to walls, and some that attach to rails; very strong, and often funny (DS has a row of very tiny chairs mounted on the wall next to his door to hold coats; they are mounted facing the wall, so you hook your coat over the "back" of the 2" tall chair.) Most of their hooks are about $1-2.
Drapery hardware: good quality, and IME, a fraction of the price anyplace else charges, if you need to hang up blinds or curtains.
And yes, the big blue shopping bags, the ones with zippers. Really good for moving bulky things without having to deal with boxes, because they fold tiny when empty. They are made of Tyvek, so they don't rip and are water-resistant, and the handles can be worn as a backpack, too.
It's a scoop of mashed potatoes topped with 3 Swedish meatballs, their gravy and ligonberry sauce. (It's similar to chunky cranberry sauce.) I usually order 2 and wolf them down they are so good. 
