I rejoined Costco after a break of several years. I am totally over impulse buys. That was one of several reasons that I didn't renew last time. The impulse buys cancelled out any savings.
So, now I have two lists. Things that we use and are cheaper at Costco. My other list is things that might not be cheaper but it's more convenient to buy a large package or Costco has better quality and it's worth the extra cost. I'm trying to keep the second list short.
I don't have Aldi.
so my comparisons are Wal-Mart, Amazon subscribe & save, and my local grocery store. And Azure Standard. Trader Joe's is 90 minutes away. Costco is 60 minutes away.
Cheaper at Costco
Organic butter (regular butter is cheaper at TJ's)
Olive oil
Raw tortillas (these are amazing)
Cheddar cheese
Avocado oil
Avocado mayo
Natural dish liquid
Frozen organic fruit
Frozen organic vegetables
Natural lunch meat (I need to repackage it and freeze in smaller portions)
Zip loc bags
Toilet paper
Paper towels
Hamburger & hot dog buns
Beef hot dogs (they're not nitrate free, though)
Gas & diesel
organic peanut butter
trash bags
More convenient/better quality at Costco
Baking soda (I use it in every load of laundry. I hate buying it in little boxes)
Frozen hamburger patties
I have to double check the prices on Oxi Clean and dishwasher detergent. I just bought Oxi Clean there because it was $5 off so I know that was a deal. Their regular price might not be better thang Wal-Mart, though. I need to check.
I know I found more items that were good deals but I'm not remembering. We don't buy maple syrup, anymore, otherwise that would be on the list.