Welding gloves are way cheaper than grilling gloves if you’re working around a grill or chimney a lot, and they do just as good of a job.
You can find Pink Himalayan rock salt at a Tractor Supply store for much cheaper. It’s all the rage these days for health freaks–the salt that is.
If your dog uses puppy/dog pee pads just buy the human ones near adult diapers sections. They are bigger and cheaper.
If you’re making a studio in your home or just need to soundproof a room, instead of buying “acoustic blankets” or “sound blankets”, consider buying moving blankets instead.
If you shave any body hair, baby oil makes a fantastic and inexpensive substitute for shaving cream.
Everything related to pools is up-charged to the max. If your pool needs salt, at the pool store it costs double of what a bag of salt costs at Costco. Pool lightbulbs are also way overcharged. Pool stores charge upwards of $80 for a new bulb. You can find the exact same bulb that was intended for tractors at the hardware store for $8.99 and it does the same job.
Instead of magic sponges search for melamine foam.
Weddings are cheaper (i.e. wedding planner vs. birthday planner prices, flowers, venue prices, etc.) if you call it a birthday party.
Gym mats are cheaper if you search for “horse stall mats” instead and they’re going to give you the same quality.
If you need White board cleaner, just use rubbing alcohol. It’s not a cheaper name just a cheaper product and does the same job.
For wood pellet-style cat litter, look for horse bedding. It’s the same stuff but cheaper, as it’s sold in bulk.
Instead of Zyrtec ($0.50 each), search for cetirizine ($0.02 each).
Dog poop bags are essential the same thing as diaper disposable bags and are much cheaper.
Baby wipes work just as effectively as makeup removers for a fraction of the cost.
Kirkland Signature, the Costco house brand, puts their logo on a lot of products that are made by other companies. For example, Kirkland batteries are actually Duracell batteries and are much cheaper.