Costco has more than just food so there are pros vs cons you need to weigh.
Pro:
Good meat selection at a good price
Name brand tires with coupons
Extra warranty on electronics
Cheaper gas if they have a station near you
Can split a membership.
Lots of general stuff from low wattage light bulbs, sheets, beds, over the counter medicines, etc…
Con:
Have to pay $50 year for membership
Items are usually bulk, yep Alt size.
Tires are limited to certain brands.
May not be close to you to use a lot.
Have to buy more than you may want.
Costco is near me and I have a 2 year old so I make my membership back in diapers alone. We also buy milk, eggs, meats, etc… so we use it for many things and use the coupons they send out for paper towels and other household items. So for my house its very worth it. For you it depends on close you are to one and if you think you will use it enough. Go walk around one and see if they have stuff you would get at least once a month or more.